Genre
- Congresses 39 canlyniadau
- Juvenile literature 9 canlyniadau
- Case studies 3 canlyniadau
- Problems, exercises, etc 3 canlyniadau
- Encyclopedias 2 canlyniadau
- Textbooks 2 canlyniadau
- Archives 1 canlyniadau
- Handbooks, manuals, etc 1 canlyniadau
- Illustrated works 1 canlyniadau
- Laboratory manuals 1 canlyniadau
- Ouvrages illustrés 1 canlyniadau
- Ouvrages pour la jeunesse 1 canlyniadau
- Periodicals 1 canlyniadau
- Sources 1 canlyniadau
- Statistics 1 canlyniadau