000
Generalities
000, 001, 002, 003, 004, 005, 006, ...
010
Bibliography
010, 011, 015, 016, 017, 018, 019, ...
020
Library & information sciences
020, 021, 025, 026, 027, 028, 029, ...
030
General encyclopedic works
030, 031, 032, 033, 034, 036, 039, ...
040
042, 043, 044, 047
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050
General serials & their indexes
050, 051, 052, 054, 055, 056, 059, ...
060
General organization & museology
060, 061, 062, 065, 066, 068, 069, ...
070
News media, journalism, publishing
070, 071, 072, 073, 074, 077, 079, ...
080
General collections
080, 081, 082, 083, 084, 086, 089, ...
090
Manuscripts & rare books
090, 091, 092, 094, 095, 096, 098, ...
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