Devils Sinkhole

1971

1:24k

Randolph Air Force Base : San Antonio Texas : Vicinity map

1950

United States. Air Force

1:500k

Lackland Air Force Base : San Antonio Texas : Vicinity map

1950

United States. Air Force

1:500k

Kelly Air Force Base : San Antonio Texas : Vicinity map.

1952

United States. Air Force

1:500k

San Marcos Air Force Base : San Marcos Texas : Vicinity map

1951

United States. Air Force

1:500k

Laughlin Air Force Base : El Rio Texas : Vicinity map

1951

United States. Air Force

1:500k

Del Rio

1935

C&GS

1:499k

Rock Springs

1891

1:125k

Llano

1964

1:250k

Llano

1954

1:250k