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Topic
- Minerals 15
- Gold 10
- Gold mines and mining 6
- Mines and mineral resources 6
- Antiquities 5
- Fossils 5
- Museum exhibits 5
- Oregon--History 5
- University of Oregon 5
- Quartz 4
- Staged photography 4
- Classrooms 1
- College students 1
- Laboratories 1
- McArthur, Joseph W. 1
- Simple machines 1
- Surveying--Instruments 1
- Swatz, Homer J. 1
- Telegraph--Equipment and supplies 1
