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Subject
- Geology78
- History53
- Description and travel51
- Antiquities34
- Historic sites30
- Hiking29
- Rock climbing29
- Architecture28
- Mountaineering21
- Geology, Stratigraphic17
- Natural history17
- Guidebooks16
- Buildings, structures, etc15
- Excavations (Archaeology)15
- Walking14
- Automobile travel13
- Art12
- History, Local12
- Historic buildings10
- Church buildings9