Genre
- Handbooks, manuals, etc 297 canlyniadau
- Congresses 207 canlyniadau
- Biography 160 canlyniadau
- Case studies 130 canlyniadau
- Dictionaries 119 canlyniadau
- Popular works 107 canlyniadau
- Periodicals 94 canlyniadau
- Early works to 1800 65 canlyniadau
- Statistics 47 canlyniadau
- Cross-cultural studies 39 canlyniadau
- Encyclopedias 39 canlyniadau
- Directories 31 canlyniadau
- Juvenile literature 31 canlyniadau
- Textbooks 29 canlyniadau
- Bibliography 22 canlyniadau
- Miscellanea 20 canlyniadau
- Statistical methods 20 canlyniadau
- Statistics, Medical 20 canlyniadau
- Problems, exercises, etc 19 canlyniadau
- Maps 14 canlyniadau
- Catalogs 13 canlyniadau
- Guidebooks 12 canlyniadau
- Atlases 11 canlyniadau
- Classification 11 canlyniadau
- Anecdotes 10 canlyniadau
- Indexes 10 canlyniadau
- Longitudinal studies 10 canlyniadau
- Pictorial works 10 canlyniadau
- Commentaries 9 canlyniadau
- Interviews 9 canlyniadau
- Sources 8 canlyniadau
- Controversial literature 7 canlyniadau
- Outlines, syllabi, etc 7 canlyniadau
- Terminology 7 canlyniadau
- Databases 5 canlyniadau
- Laboratory manuals 5 canlyniadau
- Correspondence 4 canlyniadau
- Designs and plans 4 canlyniadau
- Terms and phrases 4 canlyniadau
- Abstracts 3 canlyniadau
- Exhibitions 3 canlyniadau
- Folklore 3 canlyniadau
- Genealogy 3 canlyniadau
- Personal narratives 3 canlyniadau
- Tables 3 canlyniadau
- Art 2 canlyniadau
- Bio-bibliography 2 canlyniadau
- Charts, diagrams, etc 2 canlyniadau
- Comic books, strips, etc 2 canlyniadau
- Early works to 1850 2 canlyniadau rhagor...