Genre
- Periodicals 42 bohtosa
- Congresses 16 bohtosa
- Observations 14 bohtosa
- Textbooks 7 bohtosa
- Popular works 6 bohtosa
- Dictionaries 4 bohtosa
- Encyclopedias 3 bohtosa
- Laboratory manuals 2 bohtosa
- Observers' manuals 2 bohtosa
- Problems, exercises, etc 2 bohtosa
- Tables 2 bohtosa
- Charts, diagrams, etc 1 bohtosa
- Handbooks, manuals, etc 1 bohtosa
- Miscellanea 1 bohtosa
- Statistics 1 bohtosa