| 0 Information 196,271 âšī¸ | 1 Philosophy and Psychology 182,817 đ | 2 Religion 463,618 đđŊ | 3 Social Sciences 1,017,722 đĢ | 4 Language 130,463 đŦ | 5 Mathematics and Science 322,970 đŦ | 6 Technology 751,858 đĄ | 7 Arts and Recreation 695,837 đ¨ | 8 Literature 929,792 đ | 9 Biography and History 592,368 đŋ |
| 00 Computing And Information 114,298 đģ | 01 Bibliographies 20,998 đ | 02 Library and Information Sciences 23,802 đ | 03 Dictionaries And Encyclopedias 9,512 đ | 04 [Formerly "Biographies"; Currently unassigned] 859 đŗđŧ | 05 Periodicals 2,832 đ | 06 Organizations 3,901 đĸ | 07 Journalism And Publishing 13,427 đ° | 08 Quotations 5,075 đŦ | 09 Manuscripts and rare books 1,567 đ |
| 010 Bibliography 559 đ | 011 General Bibliographies 2,212 đĢ | 012 Of Individuals 275 đ¨đž | 013 -- 93 𤡠| 014 Of Special Forms; Pseudonyms; etc. 86 đļ | 015 Of Special Countries 671 đē | 016 Of Special Subjects 16,533 đ¤ | 017 Classed and Alphabetical Catalogs 229 đ | 018 Author Catalogs 224 đĩđŊ | 019 Dictionary Catalogs 116 đ |
| 016.0 Information 778 âšī¸ | 016.1 Philosophy And Psychology 308 đ | 016.2 Religion 839 đđŊ | 016.3 Social Sciences 2,602 đĢ | 016.4 Language 280 đŦ | 016.5 Mathematics And Science 566 đŦ | 016.6 Technology 730 đĄ | 016.7 Arts And Leisure 3,186 đ¨ | 016.8 Literature 3,121 đ | 016.9 Biography and History 3,665 đ |
| 016.80 By Topic 446 | 016.81 American & Canadian 985 | 016.82 English 1,108 | 016.83 German 122 | 016.84 French 121 | 016.85 Italian & Romanian 31 | 016.86 Spanish & Portuguese 122 | 016.87 Latin 19 | 016.88 Greek & Other Classical 24 | 016.89 Other Languages 86 |
| 016.820 98 | 016.821 Poetry 214 | 016.822 Drama 178 | 016.823 Fiction 380 | 016.824 Essays 9 | 016.825 | 016.826 | 016.827 Wit & Humour 4 | 016.828 English Authors; English Miscellany 113 | 016.829 Old English literature, ca. 450-1100 12 |
| 016.8230 47 | 016.8231 1 | 016.8232 1 | 016.8233 2 | 016.8234 | 016.8235 6 | 016.8236 4 | 016.8237 6 | 016.8238 20 | 016.8239 51 |
MDS classes with significant recommendations overlap, excluding ones under the same top-level class.
