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Subject (Region)
- Africa1
- Alaska, Department and District of (1867-1912)2
- Antarctica1
- Arctic1
- Arkansas1
- Australia7
- Austria1
- Bartow County, Georgia1
- Belgium1
- Botswana1
- Boulder County, Colorado1
- Brazil1
- British Guiana (1831-1966)1
- Caddo Parish, Louisiana1
- California1
- China1
- Clinton County, Michigan1
- Coconino Sandstone (Ariz.)2
- Colorado1
- Congo (Brazzaville)1