Genre
- Electronic books 222 Treffer
- Biography 54 Treffer
- Maps 10 Treffer
- Case studies 8 Treffer
- Sources 8 Treffer
- Anecdotes 6 Treffer
- Guidebooks 6 Treffer
- Congresses 4 Treffer
- Diaries 4 Treffer
- Early works to 1800 4 Treffer
- Miscellanea 4 Treffer
- Chronology 2 Treffer
- Correspondence 2 Treffer
- In art 2 Treffer
- Tours 2 Treffer