Genre
- Congresses 31 Treffer
- Handbooks, manuals, etc 20 Treffer
- Case studies 11 Treffer
- Cross-cultural studies 2 Treffer
- Problems, exercises, etc 2 Treffer
- Classification 1 Treffer
- Early works to 1800 1 Treffer
- Examinations, questions, etc 1 Treffer
- Identification 1 Treffer
- Maps 1 Treffer
- Observations 1 Treffer
- Periodicals 1 Treffer
- Textbooks 1 Treffer