Rio Grande Embayment, (TX) [A1039]
Survey Size: 35,843 miles Flight Lines: East-West, ½-mile spacing, except, 2-mile spacing in western part of Webb, northeastern part of Duval, and northern part of Jim Wells Counties Tie Lines: a) North-South, 1½-mile spacing in western portion including all or portions of Webb, Zapata, Starr, Jim Hogg, and Duvall Counties b) North-South, 5-mile spacing in