GENERAL WORKS.
--Dictionaries and Other General Reference Works.
----On This Day.
--Academies and Societies.

PHILOSOPHY. PSYCHOLOGY. RELIGION.
--Philosophy (General).
--Psychology. Parapsychology. The Occult.
--Ethics. Social Usages. Etiquette.
--Religions. Mythology. Rationalism.
--Judaism.
--Buddhism.
--Christianity.
--The Bible.
--Practical Theology.
----Times and Seasons. The Church Year.
----Religious Societies, Associations, Etc.
----Missions.
--Christian Denominations.

AUXILIARY SCIENCES OF HISTORY.
--Biography.

HISTORY: GENERAL AND OLD WORLD.
--History (General). Europe (General).
--Great Britain.
--Austria. Liechtenstein. Hungary. Czechoslovakia.
--France. Andorra. Monaco.
--Germany.
--Greece.
--Italy.
--Low Countries. Benelux Countries.
----Belgium.
----Luxembourg.
--The Netherlands.
--Eastern Europe.
----Russia. Soviet Union. Former Soviet Republics.
----Poland.
--Northern Europe. Scandinavia.
----Denmark.
----Norway.
--Spain. Portugal.
--Switzerland.
--Balkan Peninsula.
----History. Balkan War, 1912-1913.
----Bulgaria.
----Romania.
----Turkey
----Albania.
----Former Republics of Yugoslavia.
--Asia.
--Africa.
--Australia. Oceania.

AMERICAN HISTORY.
--Indians of North America.
--Discovery of America and Early Explorations.
--United States: General History and Description.
----Presidents (General). History of the Presidency.
----Historical Geography.
----Military History.
----Naval History.
----Afro-Americans.
----Colonial History, 1607-1775.
----The Revolution, 1775-1783.
----Revolution to the Civil War, 1775/1783-1861.
----Civil War Period, 1861-1865.
----Late Nineteenth Century, 1865-1900.
----Early Twentieth Century, 1901-1960.
----Late Twentieth Century, 1961-2000.
--United States: Local History and Description.
----New England.
----Atlantic Coast. Middle Atlantic States.
----The South. South Atlantic States.
----Gulf States. West Florida.
----Old Southwest. Lower Mississippi Valley.
----Old Northwest. Northwest Territory.
----The West. Trans-Mississippi Region. Great Plains.
----New Southwest. Colorado River, Canyon, and Valley.
----Pacific States.
--Canada.
--Mexico.
--Central America.
--West Indies.
--South America.

GEOGRAPHY. ANTHROPOLOGY. RECREATION.
--Geography (General). Atlases. Maps.
----Geographers.
----History of Discoveries, Explorations, and Travel.
----Special Voyages and Travels.
----Seafaring Life, Ocean Travel, Etc.
----Arctic and Antarctic Regions.
--Mathematical Geography. Cartography.
--Physical Geography.
--Oceanography.
--Anthropology.
--Folklore.
--Manners and Customs.
--Recreation. Leisure.
----Physical Education and Training.
----Sports.
----Dancing.
----Circuses, Spectacles, Etc.

SOCIAL SCIENCES.
--Economic Theory. Demography.
--Economic History and Conditions.
--Industries. Land Use. Labor.
----Industry.
----Labor. Work. Working Class.
----Agricultural Industries.
----Mineral Industries. Metal Trade.
----Mechanical Industries.
----Miscellaneous Industries and Trades.
--Transportation and Communications.
----United States.
----Water Transportation.
----Railroads. Rapid Transit Systems.
----Postal Service. Stamps. Philately.
----Telecommunication Industry. Telegraph.
----Telephone Industry.
----Artificial Satellite Telecommunications.
--Commerce.
----United States.
----Advertising.
--Finance.
----Banking.
--Public Finance.
----United States.
----Revenue. Taxation. Internal Revenue.
--The Family. Marriage. Women.
--Societies: Secret, Benevolent, Etc.
--Communities. Classes. Races.
----Classes.
------Slavery.
--Social Pathology. Social and Public Welfare. Criminology.
----Social Service. Social Work. Charity Organization and Practice.
----Emergency Management.
----People with Disabilities.
----Alcoholism. Intemperance. Temperance Reform.
----Criminology.
----Criminal Justice Administration.
--Socialism. Communism. Anarchism.

POLITICAL SCIENCE.
--Political Theory.
--Political Institutions and Public Administration: United States.
--Political Institutions and Public Administration: Europe.
--International Relations.

LAW.
--America. North America.
--Law of the United States.
--Law of Nations.
----War Crime Trials.

EDUCATION.
--History of Education.
--Theory and Practice of Education.
--Individual Institutions: United States.
--Individual Institutions: Asia, Africa, Australia, New Zealand, Pacific Islands.

FINE ARTS.
--Visual Arts.
--Architecture.
--Sculpture.
--Drawing. Design. Illustration.
----History of Drawing.
----Illustration.
----Greeting Cards, Postcards, Invitations, Book Jackets, Etc.
--Painting.
--Print Media.
----Lithography.
--Decorative Arts.
----Metalwork.
----Waxworking.

LINGUISTICS. LANGUAGES. LITERATURES.
--Greek Language and Literature. Latin Language and Literature.
--Germanic Languages. Scandinavian Languages.
--English Language.
--Slavic Languages. Baltic Languages. Albanian Language.
----Russian Literature.
--Literature (General).
----The Performing Arts. Show Business.
----Motion Pictures.
----Dramatic Arts. The Theater.
----Journalism. The Periodical Press, Etc.
--English Literature.
--American Literature.
--Romance Literatures.
----French Literature.
----Italian Literature.
----Spanish Literature.
--Germanic Literatures. Scandinavian Literatures.
----German Literature.
----Danish Literature.

SCIENCE.
--Science (General).
--Mathematics.
--Astronomy.
--Physics.
--Chemistry.
--Geology.
--Botany.
--Natural History (General). Biology (General).
--Zoology.
--Physiology.
--Microbiology.

MEDICINE.
--Medicine (General).
----History of Medicine. Medical Expeditions.
----Missionary Medicine. Medical Missionaries.
----Practice of Medicine. Medical Practice Economics.
--Public Aspects of Medicine.
----Public Health. Hygiene. Preventive Health.
--Internal Medicine. Practice of Medicine.
----Diseases of the Genitourinary System. Urology.
--Surgery.
--Dentistry.
--Pharmacy and Materia Medica.
--Nursing.

AGRICULTURE.
--Agriculture (General).
----History.
----Farm Machinery and Farm Engineering.
--Plant Culture.
----Propagation.
----Field Crops.
----Vegetables.
----Fruit and Fruit Culture.
--Forestry.
--Animal Culture.
----Cattle.
----Horses.
----Sheep. Wool.
----Alpacas, Llamas, Etc.
----Dogs. Dog Racing.
----Birds. Cage Birds.

TECHNOLOGY.
--Technology (General).
----Invention and Inventions.
----Biography.
----Exhibitions. Trade Shows. World's Fairs.
--Engineering (General). Civil Engineering (General).
--Hydraulic Engineering.
----Dams. Barrages.
--Highway Engineering. Roads and Pavements.
--Railroad Engineering and Operation.
--Bridge Engineering.
--Building Construction.
--Mechanical Engineering and Machinery.
----Biography.
----Machines and Mechanics (General).
----Steam Engineering.
----Vacuum Technology.
--Electrical Engineering. Electronics. Nuclear Engineering.
----Production of Electric Energy or Power. Powerplants. Central Stations.
----Electric Lighting.
----Telecommunication.
----Electronics.
----Nuclear Engineering. Atomic Power.
--Motor Vehicles. Aeronautics. Astronautics.
----Motor Vehicles.
----Aeronautics. Aeronautical Engineering.
----Rocket Propulsion. Rockets.
----Astronautics. Space Travel.
--Mining Engineering. Metallurgy.
--Chemical Technology.
----Biography.
----Fermentation Industries. Beverages. Alcohol.
----Clay Industries. Ceramics. Glass.
--Photography.
--Manufactures.
----Metal Manufactures. Metalworking.
----Paper Manufacture and Trade.
----Textile Industries.
----Rubber Industry.
----Wheelwright Industry.
----Audio-Visual Equipment.
--Home Economics.
----Food Preservation.
----Cookery.
----Hospitality Industry. Hotels, Clubs, Restaurants, Etc. Food Service.

MILITARY SCIENCE.
--Military Science (General).
----Biography.
----Atomic Warfare. Atomic Weapons.
----History of Arms and Armor.
--Armies: Organization, Distribution, Military Situation.
--Military Administration.
----Minorities, Women, Etc. in Armed Forces.
--Artillery.
--Military Engineering. Air Forces. Air Warfare.
----Military Signaling.
----Air Forces: By Region or Country.
----Air Forces: Education and Training.
----Air Defenses.
----Air Warfare: Equipment and Supplies.

NAVAL SCIENCE.
--Naval Science (General).
--Navies: Organization, Distribution, Naval Situation.
--Naval Architecture. Shipbuilding. Marine Engineering.
----Biography.
----Sailing Ships.
----Submarines.

BIBLIOGRAPHY. LIBRARY SCIENCE. INFORMATION RESOURCES.
--Printing: History.
--Printers and Printing Establishments.
--Practical Printing.
--Bookselling and Publishing.
--Library Science. Information Science.
--Books for Special Classes of Persons, Institutions, Etc.