1970 CENSUS OF HOUSING VOLUME 1, PT. 15

1982 CENSUS OF GOVERNMENTS

A SYSTEM OF ELECTROTHERAPEUTICS

A SYSTEM OF ELECTROTHERAPEUTICS AS TAUGHT BY THE INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA.

A SYSTEM OF ELECTROTHERAPEUTICS V. 3 VOLUME 3, PT. 2

A SYSTEM OF ELECTROTHERAPEUTICS VOLUME 4

A SYSTEM OF ELECTROTHERAPEUTICS VOLUME 49

A SYSTEM OF ELECTROTHERAPEUTICS VOLUME 50

A SYSTEM OF ELECTROTHERAPEUTICS VOLUME 6; VOLS. II THROUGH VI.

A TEXTBOOK OF ELECTRIC LIGHTING AND RAILWAYS VOLUME 1

A TEXTBOOK OF ELECTRIC LIGHTING AND RAILWAYS VOLUME 2

A TEXTBOOK ON APPLIED CHEMISTRY VOLUME 1

A TEXTBOOK ON APPLIED CHEMISTRY VOLUME 3

A TEXTBOOK ON CIVIL ENGINEERING VOLUME 1

A TEXTBOOK ON CIVIL ENGINEERING VOLUME 2

A TEXTBOOK ON COAST AND LAKE NAVIGATION VOLUME 2

A TEXTBOOK ON COAST AND LAKE NAVIGATION; INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA.

A TEXTBOOK ON ELECTRIC LIGHTING AND RAILWAYS VOLUME 1; INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA

A TEXTBOOK ON ELECTRIC LIGHTING AND RAILWAYS VOLUME 2; INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA

A TEXTBOOK ON ELECTRIC LIGHTING AND RAILWAYS VOLUME 3; INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA

A TEXTBOOK ON ELECTRIC LIGHTING AND RAILWAYS; GEOMETRICAL DRAWING, MECHANICAL DRAWING, ELECTRIC RAILWAYS

A TEXTBOOK ON ELECTRIC LIGHTING AND RAILWAYS; INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA VOLUME 4

A TEXTBOOK ON FRENCH VOLUME 1

A TEXTBOOK ON GERMAN VOLUME 1

A TEXTBOOK ON GERMAN VOLUME 2

A TEXTBOOK ON GERMAN VOLUME 2; GRAMMAR

A TEXTBOOK ON GERMAN VOLUME 3

A TEXTBOOK ON MARINE ENGINEERING VOLUME 1; STEAM AND STEAM BOILERS, STEAM ENGINES, THE MACHINERY OF WESTERN RIVER STEAMBOATS, RECENT DEVELOPMENTS IN MARINE ENGINEERING

A TEXTBOOK ON MARINE ENGINEERING VOLUME 2

A TEXTBOOK ON MARINE ENGINEERING VOLUME 4

A TEXTBOOK ON MARINE ENGINEERING; ELEMENTS OF ELECTRICITY AND MAGNETISM, DYNAMOS AND MOTORS, OPERATION OF DYNAMOS AND MOTORS, GEOMETRICAL DRAWING, MECHANICAL DRAWING

A TEXTBOOK ON MECHANICAL ENGINEERING VOLUME 3

A TEXTBOOK ON MECHANICAL ENGINEERING VOLUME 4

A TEXTBOOK ON MECHANICAL ENGINEERING VOLUME 5

A TEXTBOOK ON MERCANTILE DECORATION

A TEXTBOOK ON METALLURGY OF GOLD, SILVER, COPPER, LEAD, AND ZINC VOLUME 2

A TEXTBOOK ON METALLURGY OF GOLD, SILVER, COPPER, LEAD, AND ZINC VOLUME 3

A TEXTBOOK ON METALLURGY OF GOLD, SILVER, COPPER, LEAD, AND ZINC VOLUME 4

A TEXTBOOK ON MINING ENGINEERING VOLUME 1

A TEXTBOOK ON MINING ENGINEERING VOLUME 2

A TEXTBOOK ON MINING ENGINEERING VOLUME 3

A TEXTBOOK ON MINING ENGINEERING VOLUME 4

A TEXTBOOK ON MINING ENGINEERING VOLUME 5

A TEXTBOOK ON MINING ENGINEERING VOLUME 6

A TEXTBOOK ON MINING ENGINEERING VOLUME 8

A TEXTBOOK ON PLUMBING, HEATING, AND VENTILATION VOLUME 1

A TEXTBOOK ON PLUMBING, HEATING, AND VENTILATION VOLUME 2

A TEXTBOOK ON PLUMBING, HEATING, AND VENTILATION VOLUME 3

A TEXTBOOK ON PLUMBING, HEATING, AND VENTILATION VOLUME 5

A TEXTBOOK ON SHEET-METAL PATTERN DRAFTING VOLUME 2

A TEXTBOOK ON STEAM ENGINEERING

A TEXTBOOK ON STEAM ENGINEERING VOLUME 1

A TEXTBOOK ON STEAM ENGINEERING VOLUME 2

A TEXTBOOK ON STEAM ENGINEERING VOLUME 5

A TEXTBOOK ON SURVEYING AND MAPPING VOLUME 1

A TEXTBOOK ON SURVEYING AND MAPPING VOLUME 2

A TEXTBOOK ON SURVEYING AND MAPPING VOLUME 3

A TEXTBOOK ON THE GAS ENGINE

A TEXTBOOK ON THE WESTINGHOUSE AIR BRAKE

A TREATISE ON ARCHITECTURE AND BUILDING CONSTRUCTION, PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS VOLUME 2

A TREATISE ON ARCHITECTURE AND BUILDING CONSTRUCTION, PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS VOLUME 5

A TREATISE ON BOOKKEEPING AND STENOGRAPHY

A TREATISE ON BOOKKEEPING AND STENOGRAPHY VOLUME 1

A TREATISE ON BOOKKEEPING AND STENOGRAPHY VOLUME 2

A TREATISE ON CHEMISTRY AND CHEMICAL ANALYSIS

A TREATISE ON CHEMISTRY AND CHEMICAL ANALYSIS VOLUME 2

A TREATISE ON CHEMISTRY AND CHEMICAL ANALYSIS VOLUME 5; QUANTITATIVE ANALYSIS

A TREATISE ON CHEMISTRY AND CHEMICAL ANALYSIS VOLUME 6

A TREATISE ON CHEMISTRY AND CHEMICAL ANALYSIS; ARITHMETIC, ELEMENTARY ALGEBRA, AND TRIGONOMETRIC FUNCTIONS, PHYSICS, THEORETICAL CHEMISTRY VOLUME 1

A TREATISE ON CHEMISTRY AND CHEMICAL ANALYSIS; ORGANIC CHEMISTRY VOLUME 4

A TREATISE ON COAL MINING VOLUME 2, PTS. 11-21

A TREATISE ON COAL MINING VOLUME 26-33

A TREATISE ON COAL MINING VOLUME 3, PTS. 22-25

A TREATISE ON ELECTRIC STREET-CAR RUNNING; HEATING AND LIGHTING, GENERAL INSTRUCTIONS, METALLIC-RETURN SYSTEM, BRAKES, HINTS ON THE OPERATION OF ELECTRIC CARS

A TREATISE ON ELECTRIC STREET-CAR RUNNING; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA VOLUME 2

A TREATISE ON METAL MINING; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS. ... . WITH PRACTICAL QUESTIONS AND EXAMPLES VOLUME 1

A TREATISE ON METAL MINING; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS. ... . WITH PRACTICAL QUESTIONS AND EXAMPLES VOLUME 4

A TREATISE ON PROSPECTING; BLOWPIPING, MINERALOGY, ASSAYING, GEOLOGY, PROSPECTING, PLACER AND HYDRAULIC MINING

A TREATISE ON REFRIGERATING AND ICE-MAKING MACHINERY VOLUME 1

A TREATISE ON REFRIGERATING AND ICE-MAKING MACHINERY VOLUME 2

A TREATISE ON REFRIGERATING AND ICE-MAKING MACHINERY VOLUME 5

A TREATISE ON TELEGRAPHY VOLUME 2; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA

A TREATISE ON TELEGRAPHY VOLUME 4; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA

A TREATISE ON TELEGRAPHY; ANSWERS TO QUESTIONS

A TREATISE ON TELEGRAPHY; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS, SCRANTON, PA VOLUME 2

A TREATISE ON TELEPHONY

A TREATISE ON TELEPHONY VOLUME 1

A TREATISE ON TELEPHONY VOLUME 1

A TREATISE ON TELEPHONY VOLUME 2

A TREATISE ON TELEPHONY VOLUME 4

A TREATISE ON THE LOCOMOTIVE AND THE AIR BRAKE

A TREATISE ON THE LOCOMOTIVE AND THE AIR BRAKE VOLUME 3

A TREATISE ON THE LOCOMOTIVE AND THE AIR BRAKE; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS ... WITH NUMEROUS PRACTICAL QUESTIONS VOLUME 1

ACCOUNTING

ACCOUNTING METHODS OF BANKS

ADVERTISEMENT DISPLAY

ALLGEMEINE GESCHICHTE VON DER URZEIT BIS AUF DIE HEUTIGEN TAGE VOLUME 1-2

ALTDANISCHE HELDENLIEDER, BALLADEN UND MARCHEN

ALTERNATING-CURRENT MEASURING INSTRUMENTS

AMBITION VOLUME 12-13

AMBITION; A JOURNAL OF INSPIRATION TO SELF HELP VOLUME 10-11

AMBITION; A JOURNAL OF INSPIRATION TO SELF HELP VOLUME 6, NO. 1 - V. 9, NO. 1

AN ACCOUNT OF THE DIOCESE OF SODOR AND MAN AND ST. GERMAN'S CATHEDRAL; ALSO A RECORD OF THE BISHOPS OF SODOR AND MAN AND A TABULAR STATEMENT OF THE R

AN ELEMENTARY TREATISE ON ELECTRIC POWER AND LIGHTING; ARITHMETIC, MEASURATION, MECHANICS

AN ELEMENTARY TREATISE ON PLUMBING, HEATING, AND VENTILATION; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS ... WITH PRACTICAL QUESTIONS AND EXAMPLES VOLUME 1

AN ELEMENTARY TREATISE ON PLUMBING, HEATING, AND VENTILATION; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS ... WITH PRACTICAL QUESTIONS AND EXAMPLES VOLUME 2

AN ELEMENTARY TREATISE ON PLUMBING, HEATING, AND VENTILATION; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS ... WITH PRACTICAL QUESTIONS AND EXAMPLES VOLUME 3

AN ELEMENTARY TREATISE ON PLUMBING, HEATING, AND VENTILATION; PREPARED FOR STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS ... WITH PRACTICAL QUESTIONS AND EXAMPLES VOLUME 6

AN ELEMENTARY TREATISE ON SURVEYING AND MAPPING VOLUME 1

AN ELEMENTARY TREATISE ON THE GAS ENGINE VOLUME 1

AN ELEMENTARY TREATISE ON THE GAS ENGINE VOLUME 2

AN ELEMENTARY TREATISE ON THE GAS ENGINE VOLUME 5

ANNUAL REPORT OF THE COMMISSIONER OF THE BANKING DEPARTMENT OF THE STATE OF MICHIGAN VOLUME 25

ANNUAL REPORT OF THE STATE BOARD OF HEALTH AND VITAL STATISTICS OF THE COMMONWEALTH OF PENNSYLVANIA VOLUME 12, NO. 1

ANSWERS TO QUESTIONS

ANSWERS TO QUESTIONS VOLUME 4

APPALACHIA VOLUME 11

APPALACHIA VOLUME N . 7

ARITHMETIC, MENSURATION AND USE OF LETTERS IN FORMULAS, PRINCIPLES OF MECHANICS, MACHINE ELEMENTS, MECHANICS OF FLUIDS, STRENGTH OF MATERIALS, ELEMENTS OF ELECTRICITY AND MAGNETISM, HEAT AND STEAM

ARITHMETIC, MENSURATION, ELEMENTARY ALGEBRA AND TRIGONOMETRIC FUNCTIONS, ELEMENTARY MECHANICS, PRINCIPLES OF ELECTRICITY AND MAGNETISM, ELECTRICAL MEASUREMENTS, BATTERIES

ARITHMETIC, MENSURATION, MECHANICS

AUTOMATIC TELEPHONE SYSTEMS

AUTOMOBILE CARBURETERS

AUTOMOBILE-ENGINE AUXILIARIES

BERICHTE (147-148)

BLAST ROASTING

BLAST ROASTING, LEAD MELTING AND REFINING, ELEMENTS OF ELECTROMETALLURGY, MISCELLANEOUS ELECTROMETALLURGICAL PROCESSES, ELECTROMETALLURGY OF COPPER, E

CARBURETERS, ELECTRIC IGNITION DEVICES, AUTOMOBILE AND MARINE ENGINE AUXILIARIES, POWER GAS PRODUCERS, MANAGEMENT OF MARINE GAS ENGINES, MANAGEMENT OF MARINE GAS ENGINES, MANAGEMENT OF STATIONARY GAS ENGINES, TROUBLES AND REMEDIES, POWER

CASES ARGUED AND DECIDED IN THE SUPREME COURT OF THE UNITED STATES VOLUME 33

CATALOGUE AND INDEX OF THE PUBLICATIONS OF THE UNITED STATES GEOLOGICAL SURVEY 1901 TO 1903 VOLUME 215

CATECHISME DE PERSEVERANCE, OU, EXPOSE HISTORIQUE, DOGMATIQUE, MORAL ET LITURGIQUE DE LA RELIGION DEPUIS L'ORIGINE DU MONDE JUSQU'A NOS JOURS (5 )

CHRISTIAN HEINRICH ZELLER'S LEBEN (1)

CITRUS FRUITS UNDER IRRIGATION; CITRUS FRUITS IN GULF-COAST STATES

COMMERCIAL VEGETABLES VOLUME 3

COMPILATIO STATUTORUM GENERALIUM PRO CISMONTANA FAMILIA REGULARIS OBSERVANTIAE S. P.N. FRANCISCI

CONTRIBUTIONS TO ECONOMIC GEOLOGY (SHORT PAPERS AND PRELIMINARY REPORTS) 1916 VOLUME 641

CONTRIBUTIONS TOWARD A MONOGRAPH OF THE INSECTS OF THE LEPIDOPTEROUS FAMILY NOCTUIDAE OF BOREAL NORTH AMERICA; A REVISION OF THE DELTOID MOTHS VOLUME

DAS WESEN UND DIE FORMEN DER POESIE; EIN BEITRAG ZUR PHILOSOPHIE DES SCHONEN UND DER KUNST

DER LEBENSMAGNETISMUS, SEINE ERSCHEINUNGEN UND SEINE PRAXIS; MIT BESONDERER RUCKSICHT AUF SEINE ANWENDUNG ZUR HEILUNG DER VERSCHIEDENSTEN KRANKHEITEN, NAMENTLICH DES NERVENSYSTEMS

DER PROPHET DANIEL UND DIE OFFENBARUNG JOHANNIS; IN IHREM GEGENSEITIGEN VERHALTNISS BETRACHTET UND IN IHREN HAUPTSTELLEN ERLAUTERT

DESIGN OF ROOF TRUSSES AND MILL BUILDINGS BY I.C.S. STAFF

DIE GRENZBOTEN (56, PT. 2)

DIE SPIELE DER MENSCHEN (37, NO. 1, PT. 2)

DIE WIRKUNG DER ARZNEIMITTEL UND GIFTE IM GESUNDEN THIERISCHEN KORPER; NACH FREMDEN UND EIGENEN BEOBACHTUNGEN. S - Z (5)

DIVORZIO

DOCUMENTS OF THE ASSEMBLY OF THE STATE OF NEW YORK VOLUME 133, NO. 32

DOCUMENTS OF THE ASSEMBLY OF THE STATE OF NEW YORK VOLUME 57, NOS. 1-2

DRILLING

DUPLEX AND QUADRUPLEX TELEGRAPHY; MULTIPLEX TELEGRAPHY TESTING OF CIRCUITS PRINTING AND MESSENGER-CALL SYSTEMS SUBMARINE TELEGRAPHY HIGH-SPEED TELEGRAPHY

DYNAMO DESIGN; MOTOR DESIGN ALTERNATING CURRENTS

EL CENSOR; PERIODICO POLITICO Y LITERARIO (5)

ELECTRIC POWER STATIONS; ELECTRIC RAILWAY SYSTEMS, LINE AND TRACK, LINE CALCULATIONS, MOTORS AND CONTROLLERS, ELECTRIC-CAR EQUIPMENT, MULTIPLE-UNIT SYSTEMS

ELECTRICITY & MAGNETISM; THEORY OF DIRECT-CURRENT GENERATORS & MOTORS DIRECT-CURRENT GENERATORS DIRECT-CURRENT MOTORS RESISTANCE MEASUREMENTS DIRECT-CURRENT MEASURING INSTRUMENTS ALTERNATING CURRENTS ALTERNATORS TRANSFORMERS ALTERNATING-CURRENT RECTIFIERS

ELECTRICITY AND MAGNETISM VOLUME 143

ELEMENTS OF ELECTRICITY AND MAGNETISM, DIRECT-CURRENT DYNAMOS AND MOTORS, ALTERNATING-CURRENT MACHINERY, OPERATION OF DYNAMO-ELECTRIC MACHINERY, TRANSMISSION, LIGHTING, AND SIGNALING, HYDROMECHANICS, MINE PUMPS, FIRST AID TO THE INJURED

ELEMENTS OF NAVIGATION, CHART, LEAD, & LOG DEVIATION & COMPASS COMPENSATION, PILOTING, DEAD RECKONING, NAUTICAL TABLES

ELEMENTS OF TELEGRAPH OPERATING, TELEGRAPHY VOLUME 2

ELEMENTS OF TELEGRAPH OPERATING; ELEMENTARY TELEGRAPHY TELEGRAPHY TELEGRAPH REPEATERS POWER EQUIPMENT

ELENCHUS PLANTARUM NOVARUM MINUSQUE COGNITARUM

ENGRAVING AND PRINTING METHODS, ADVERTISEMENT ILLUSTRATION, ADVERTISING RECORDS AND SYSTEMS, STREET-CAR ADVERTISING, OUTDOOR ADVERTISING, THE ADVERTISING AGENCY

EXCAVATING, SHORING, AND PILING

FIELDS OF ADVERTISING EMPLOYMENT VOLUME 162

FOREIGN EXCHANGE VOLUME 2

FORMULAIRE DES ACTES DES NOTAIRES; AVEC ANNOTATIONS ... SUIVI DU TEXTE DU CODE NAPOLEON ET DU CODE DE PROCEDURE CIVILE, MODIFIE PAR LA LOI DU 21 MAI 1858, AVEC CONFERENCE DES ARTICLES ENTRE EUX, ET D'UN SUPPLEMENT, CONTENANT DIVERS

GAS AND OIL ENGINES; MANAGEMENT OF STATIONARY GAS ENGINES; THEORETICAL CHEMISTRY; PRACTICAL CHEMISTRY; ELEMENTARY INORGANIC CHEMISTRY

GASES MET WITH IN MINES

GASOLINE AUTOMOBILES

GEOLOGICAL SURVEY CIRCULAR VOLUME 482-490

GEOLOGICAL SURVEY WATER-SUPPLY PAPER VOLUME 1243-1245

GEOLOGICAL SURVEY WATER-SUPPLY PAPER VOLUME 1271-1272

GEOLOGICAL SURVEY WATER-SUPPLY PAPER VOLUME 1512

GEOLOGICAL SURVEY WATER-SUPPLY PAPER VOLUME 1559-1560

GEOLOGICAL SURVEY WATER-SUPPLY PAPER VOLUME 1577

GEOLOGICAL SURVEY WATER-SUPPLY PAPER VOLUME 1613

GEOMETRICAL DRAWING; MECHANICAL DRAWING SKETCHING PRACTICAL PROJECTION DEVELOPMENT OF SURFACES

GESCHICHTE DER VIER FELDZUGE DES FRANZOSISCHEN REVOLUTIONS-KRIEGES; VON EINEM DEUTSCHEN OFFIZIER VOLUME 1; V. 1792

GOETHE'S SAMMTLICHE WERKE (23 )

GRINDING

GRINDING. BENCH, VISE, AND FLOOR WORK. GENERAL HINTS ON SHOP PRACTICE. TOOLMAKING

GRINDING. BENCH, VISE, AND FLOOR WORK. GENERAL HINTS ON SHOP PRACTICE. TOOLMAKING VOLUME 3

HISTORY OF ARCHITECTURE, ARCHITECTURAL DESIGN, SPECIFICATIONS

HISTORY OF BANKING VOLUME 1; NATIONAL AND STATE BANKS NATIONAL-BANK SUPERVISION SAVINGS BANKS TRUST COMPANIES

HYDRAULICS, PNEUMATICS, GRAPHICAL STATICS, HEAT, REFRIGERATION

HYPOSULPHITE LIXIVIATION

I. C. S. REFERENCE LIBRARY VOLUME 161; A SERIES OF TEXTBOOKS PREPARED FOR THE STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS, AND CONTAINING IN PERMANENT FORM THE INSTRUCTION PAPERS, EXAMINATION QUESTIONS, AND KEYS USED IN THEIR VARIOUS COURSES

I. C. S. REFERENCE LIBRARY; A SERIES OF TEXTBOOKS PREPARED FOR THE STUDENTS OF THE INTERNATIONAL CORRESPONDENCE SCHOOLS, AND CONTAINING IN PERMANENT FORM THE INSTRUCTION PAPERS, EXAMINATION QUESTIONS, AND KEYS USED IN THEIR VARIOUS COURSES

I.C.S. REFERENCE LIBRARY VOLUME 114

I.C.S. REFERENCE LIBRARY VOLUME 115

I.C.S. REFERENCE LIBRARY VOLUME 15

I.C.S. REFERENCE LIBRARY VOLUME 161

I.C.S. REFERENCE LIBRARY VOLUME 23; A SERIES OF TEXTBOOKS

I.C.S. REFERENCE LIBRARY VOLUME 269

I.C.S. REFERENCE LIBRARY VOLUME 28; A SERIES OF TEXTBOOKS

I.C.S. REFERENCE LIBRARY VOLUME 33

I.C.S. REFERENCE LIBRARY VOLUME 47; A SERIES OF TEXTBOOKS

I.C.S. REFERENCE LIBRARY VOLUME 81

INCANDESCENT AND ARC LIGHTING; ELECTRIC-RAILWAY STATION EQUIPMENT, INTERIOR WIRING, MERCURY-VAPOR CONVERTERS, VOLTAGE REGULATION, MODERN ELECTRIC-LIGHTING DEVICES, ELECTRIC SIGNS, ELECTRIC HEATING

INFORMATION SHARING WITH FUSION CENTERS HAS IMPROVED, BUT INFORMATION SYSTEM CHALLENGES REMAIN

INSTRUCTION PAPER WITH EXAMINATION QUESTIONS; FUELS

INTERNATIONAL LIBRARY OF TECHNOLOGY VOLUME 20