Genre
- Congresses 39 Treffer
- Periodicals 23 Treffer
- Juvenile literature 13 Treffer
- Handbooks, manuals, etc 8 Treffer
- Statistics 6 Treffer
- Bibliography 2 Treffer
- Encyclopedias 2 Treffer
- Tables 2 Treffer
- Terminology 2 Treffer
- Biography 1 Treffer
- Case studies 1 Treffer
- Dictionaries 1 Treffer
- Problems, exercises, etc 1 Treffer