520|520 - Astronomy & allied sciences 797|797 - Aquatic & air sports 953|953 - Arabian Peninsula & adjacent areas 998|998 - Arctic islands & Antarctica 022|022 - Administration of physical plant 158|158 - Applied psychology 168|168 - Argument & persuasion 169|169 - Analogy 180|180 - Ancient, medieval & eastern philosophy 185|185 - Aristotelian philosophy 229|229 - Apocrypha & pseudepigrapha 239|239 - Apologetics & polemics 267|267 - Associations for religious work 283|283 - Anglican churches 354|354 - Administration of economy & environment 358|358 - Air & other specialized forces 366|366 - Associations 374|374 - Adult education 494|494 - Altaic, Uralic, Hyperborean & Dravidian 496|496 - African languages 499|499 - Austronesian & other languages 512|512 - Algebra 513|513 - Arithmetic 515|515 - Analysis 543|543 - Analytical chemistry 590|590 - Animals (Zoology) 595|595 - Arthropods 621|621 - Applied physics 630|630 - Agriculture & related technologies 636|636 - Animal husbandry 657|657 - Accounting 659|659 - Advertising & public relations 692|692 - Auxiliary construction practices 711|711 - Area planning 720|720 - Architecture 721|721 - Architectural structure 722|722 - Architecture to ca. 300 723|723 - Architecture from ca. 300 to 1399 724|724 - Architecture from 1400 739|739 - Art metalwork 796|796 - Athletic & outdoor sports & games 810|810 - American literature in English 811|811 - American poetry in English 812|812 - American drama in English 813|813 - American fiction in English 814|814 - American essays in English 815|815 - American speeches in English 816|816 - American letters in English 817|817 - American humor & satire in English 818|818 - American miscellaneous writings