Genre
- Case studies 65 canlyniadau
- Handbooks, manuals, etc 63 canlyniadau
- Encyclopedias 51 canlyniadau
- Congresses 41 canlyniadau
- Cross-cultural studies 33 canlyniadau
- Textbooks 16 canlyniadau
- Dictionaries 12 canlyniadau
- Problems, exercises, etc 11 canlyniadau
- Periodicals 7 canlyniadau
- Biography 5 canlyniadau
- Longitudinal studies 3 canlyniadau
- Terminology 3 canlyniadau
- Bibliography 2 canlyniadau
- Bio-bibliography 2 canlyniadau
- Census, 1980 2 canlyniadau
- Study guides 2 canlyniadau
- Abstracts 1 canlyniadau
- Charts, diagrams, etc 1 canlyniadau
- Databases 1 canlyniadau
- Forecasts 1 canlyniadau
- Genealogy 1 canlyniadau
- Life skills guides 1 canlyniadau
- Miscellanea 1 canlyniadau
- Sources 1 canlyniadau
- Statistics 1 canlyniadau
- Style manuals 1 canlyniadau
- Textbooks for foreign speakers 1 canlyniadau