Genre
- Electronic books 1,036 canlyniadau
- Congresses 88 canlyniadau
- Case studies 12 canlyniadau
- Laboratory manuals 12 canlyniadau
- Biography 10 canlyniadau
- Handbooks, manuals, etc 8 canlyniadau
- Anecdotes 4 canlyniadau
- Popular works 4 canlyniadau
- Rules and practice 4 canlyniadau
- Evaluation 2 canlyniadau
- Guides, manuels, etc 2 canlyniadau
- Handbooks 2 canlyniadau
- Handbooks, manuas, etc 2 canlyniadau
- Interviews 2 canlyniadau
- Maps 2 canlyniadau
- Methodology 2 canlyniadau
- Observations 2 canlyniadau
- Pictorial works 2 canlyniadau
- Social aspects 2 canlyniadau
- Statistics 2 canlyniadau