| Document Category Description | Document Category ID |
| Animals | 30 |
| Art and Painting - History | 33 |
| Art and Painting - Practical | 34 |
| Art and Painting Collections | 68 |
| Biographical | 18 |
| Boating and Navigation | 77 |
| Computing - Artificial Intelligence | 9 |
| Computing - Programming | 8 |
| Computing - The Internet | 7 |
| Conference Proceedings | 67 |
| Culture and History - Australian | 28 |
| Culture and History - British | 56 |
| Culture and History - Irish | 36 |
| Culture and History - Japanese | 19 |
| Culture and History - Politics | 29 |
| Culture and History - Scottish | 37 |
| Culture and History - USA | 45 |
| Culture and History - Wars | 50 |
| Culture and History - World | 46 |
| Fiction - Crime Thriller | 27 |
| Fiction - Erotica | 24 |
| Fiction - Fantasy | 22 |
| Fiction - Science Fiction | 21 |
| Fiction - Short Stories General | 65 |
| Fiction - Short Stories Science Fiction | 64 |
| Fiction - Uncategorised | 25 |
| Food and Recipes | 44 |
| Gaming - Cards | 43 |
| Gaming - General | 11 |
| Gardening | 71 |
| Health - History | 42 |
| Health - Informatics | 40 |
| Health - Management | 41 |
| Hobbies - Crafts | 39 |
| Knowledge | 6 |
| Knowledge - Creativity | 13 |
| Knowledge - Philosophy | 10 |
| Languages - Chinese | 73 |
| Languages - German | 75 |
| Languages - Greek | 72 |
| Languages - Italian | 70 |
| Languages - Japanese | 66 |
| Languages - Russian | 74 |
| Languages - Spanish | 76 |
| Law | 69 |
| Linguistics and Semiotics | 12 |
| Literature - Books on Books and Writers | 48 |
| Literature - Bookselling | 26 |
| Literature - Comics and Graphic Novels | 49 |
| Literature - Dictionaries and Thesauri | 62 |
| Literature - Play Scripts | 31 |
| Literature - Poetry Collections | 16 |
| Literature - Poetry Study | 23 |
| LIterature - Quotations | 52 |
| Literature - Reading | 55 |
| Literature - Short Stories - Science Fiction | 54 |
| Literature - Study of Science Fiction | 53 |
| Literature - The Study of | 15 |
| Literature - Writing | 63 |
| Management and Business | 47 |
| Movies and Videos | 32 |
| Music | 14 |
| Safety | 17 |
| Science - Astronomy and Space | 38 |
| Science - General | 1 |
| Science - Genetics | 5 |
| Science - Mathematics | 35 |
| Science - Physics | 2 |
| Science - Psychology | 4 |
| Science - Radio and Electronics | 78 |
| Science - Research | 3 |
| The Atlas | 79 |
| Travel - Australia | 59 |
| Travel - Europe | 60 |
| Travel - Ireland | 58 |
| Travel - Japan | 20 |
| Travel - Miscellaneous | 51 |
| Travel - New Zealand | 61 |
| Travel - USA | 57 |