| The Columbia Gazetteer of North America. 2000. |
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| Fronteras |
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| Fronteras (fron-TER-ahs), town (1990 pop. 962), Sonora, NW Mexico, on RR, and 32 mi/51 km S of Douglas, Ariz; 30°51'N 109°33'W. Wheat, corn, alfalfa; cattle. |
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| | | The Columbia Gazetteer of North America. Copyright © 2000 Columbia University Press. |
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