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- Architecture, American 23
- Architecture--United States 22
- Coins 15
- Rivers--Oregon 10
- Universities and colleges--Faculty 10
- Croplands 9
- Gold coins 9
- Coins--Collectors and collecting 8
- Zirconium industry 7
- Dams 5
- Railroad passenger cars 5
- Teachers 5
- Algae 4
- Buildings 4
- Farmers 4
- Food industry and trade 4
- Portraits 4
- Water--Pollution 4
- Aeronautics--Study and teaching 3
- Boys & Girls Clubs of America 3