
The Ohio River valley serves as the central artery of this mid-century survey, anchoring major urban centers like Evansville, Indiana, and Owensboro, Kentucky. The landscape is defined by the complex drainage of the Green River, Pond River, and Rough River, supporting a region heavily invested in extraction and agriculture, as evidenced by numerous coal mines and oil wells scattered throughout the quadrangle. The map captures a period of significant military and institutional presence, showing the Camp Breckinridge Military Reservation and the sprawling Hoosier National Forest.
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