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- Agricultural industries--California3
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- Labor unions--Migrant agricultural laborers--United States3
- American literature--20th century2
- Authors, American--20th century--Archives2
- Afrikaners--Mexico--History1
- Authors, American--20th century1
- Authors--United States--20th century1
- Gold mines and mining--Alaska1
- Gold mines and mining--Idaho1
- Gold mines and mining--Mexico1
- Gold mines and mining--Nevada1
- Gold mines and mining--Yukon--Klondike River Valley1
- Indians of North America--Colorado1
- Photographers--United States1
- Photographers--United States--20th Century1
- Silver mines and mining--Mexico1
- World War, 1914-1918--Intelligence service1