Genre
- Congresses 51 bohtosa
- Periodicals 30 bohtosa
- Bathymetric maps 10 bohtosa
- Maps 8 bohtosa
- Statistics 6 bohtosa
- Observations 4 bohtosa
- Bibliography 2 bohtosa
- Charts, diagrams, etc 2 bohtosa
- Juvenile literature 2 bohtosa
- Popular works 2 bohtosa
- Tables 2 bohtosa
- Case studies 1 bohtosa
- Encyclopedias 1 bohtosa
- Gazetteers 1 bohtosa
- Problems, exercises, etc 1 bohtosa