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Spatial Coverage
- Australia2
- California2
- India2
- Rhodesia and Nyasaland2
- San Francisco Bay Area2
- San Francisco Bay Area (Calif.)2
- Africa, North1
- Arkansas1
- Burlington (Colo.)1
- Colorado1
- Columbia Plateau1
- Florida1
- Great Britain1
- India.1
- Jordan1
- Mekong River Delta (Vietnam and Cambodia)1
- Middle West1
- North America1
- North America.1
- Ozark Mountains Region1
