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in subjects: "DRG maps"  
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Primary view of Creedmoor Quadrangle
Geological Survey (U.S.)
1973
Primary view of San Marcos South Quadrangle
Geological Survey (U.S.)
1973
Primary view of Lockhart North Quadrangle
Geological Survey (U.S.)
1986
Primary view of Uhland Quadrangle
Geological Survey (U.S.)
1973
Primary view of San Marcos North Quadrangle
Geological Survey (U.S.)
1973
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