Antiquities 66,322 Agriculture 63,025 African Americans 56,404 Art 49,022 Appropriations and expenditures 41,310 Architecture 39,726 Armed Forces 34,927 Accounting 27,550 American literature 24,042 Animals 22,359 Administration 22,350 Aufsatzsammlung 21,918 American poetry 20,218 Analysis 18,073 Art, Modern 16,865 Authorship 16,303 Artists 15,912 Attitudes 15,664 Anthropology 15,263 Aesthetics 13,169 Automobiles 13,122 Astronomy 11,799 Authors, American 11,526 Artificial intelligence 11,112 Airplanes 11,090 American drama 10,968 Auditing 10,607 Air 10,431 Aeronautics 10,090 Archives 9,995 Archaeology 9,822 Advertising 9,537 Automation 9,504 Arts 9,379 Architecture, Domestic 9,028 AIDS (Disease) 8,998 Atlases 8,889 American fiction 8,762 Administrative agencies 8,710 Agriculture and state 8,476 Anatomy 8,107 Aspect social 8,065 Architecture, Modern 8,060 Accidents 8,047 Apologetics 8,027 Art collections 8,009 Aging 7,972 Actors 7,839 African American authors 7,682 Algebra 7,573 Activity programs 7,545 American 7,297 Appreciation 7,274 Authors, English 7,172 Alcoholism 7,041 Aims and objectives 6,554 Application software 6,390 Adult education 6,284 Administrative and political divisions 6,162 Anniversaries, etc 6,098 Adventure and adventurers 6,023 Astrology 5,996 Americans 5,941 Arithmetic 5,899 Authors 5,828 Aged 5,820 Academic achievement 5,695 Authors, German 5,626 Arabic language 5,494 African American women 5,492 Adventure stories 5,475 Authors, French 5,364 Aeronautics, Commercial 5,211 Art, American 5,201 Arab-Israeli conflict 5,153 Assassination 5,120 American Revolution (1775-1783) 5,080 Automatic control 5,031 Architects 4,945 Anecdotes 4,873 Atrocities 4,864 Academic libraries 4,653 Antisemitism 4,606 Adolescent 4,578 Airports 4,544 Antislavery movements 4,373 Antitrust law 4,361 ART 4,343 Aids and devices 4,144 Astronautics 4,026 Alphabet 4,022 Administrative law 3,907 Aerodynamics 3,889 Adolescence 3,882 American wit and humor 3,862 Art and society 3,850 Acting 3,825 Access control 3,759 Addresses, essays, lectures 3,752 Agricultural laborers 3,748