Genre
- Congresses 106 Treffer
- Handbooks, manuals, etc 22 Treffer
- Periodicals 10 Treffer
- Encyclopedias 4 Treffer
- Biography 3 Treffer
- Textbooks 3 Treffer
- Atlases 2 Treffer
- Catalogs 2 Treffer
- Dictionaries 2 Treffer
- Juvenile literature 2 Treffer
- Miscellanea 2 Treffer
- Problems, exercises, etc 2 Treffer
- Anecdotes 1 Treffer
- Archives 1 Treffer
- Case studies 1 Treffer
- Charts, diagrams, etc 1 Treffer
- Maps 1 Treffer
- Observations 1 Treffer
- Outlines, syllabi, etc 1 Treffer
- Popular works 1 Treffer
- Statistics 1 Treffer