Genre
- Electronic books 99 bohtosa
- Handbooks, manuals, etc 6 bohtosa
- Case studies 5 bohtosa
- Examinations, questions, etc 4 bohtosa
- Outlines, syllabi, etc 2 bohtosa
- Biography 1 bohtosa
- Classification 1 bohtosa
- Congresses 1 bohtosa
- Dictionaries 1 bohtosa
- Miscellanea 1 bohtosa
- Periodicals 1 bohtosa
- Popular works 1 bohtosa
- Problems, exercises, etc 1 bohtosa
- Statistics 1 bohtosa