| Feature Name: | Marthas Island (historical)
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| Feature Type: | island
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| State: | South Dakota
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| County: | Gregory
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| County Population: | 4792
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| County Housing Units: | 2405
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| County Size: | 1015.93 Square Miles
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| Latitude: | 43.11556
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| Longitude: | -98.74167
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| Map Cell Name: | Lake Andes SW
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| Geographic Keywords: | Historical,
Marthas
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