Genre
- Electronic books 288 canlyniadau
- Congresses 28 canlyniadau
- Classification 24 canlyniadau
- Biography 12 canlyniadau
- Handbooks, manuals, etc 6 canlyniadau
- Popular works 6 canlyniadau
- Textbooks 4 canlyniadau
- Dictionaries 2 canlyniadau
- Early works to 1800 2 canlyniadau
- Encyclopedias 2 canlyniadau
- Glossaries, vocabularies, etc 2 canlyniadau
- Laboratory manuals 2 canlyniadau
- Nomenclature 2 canlyniadau