1979. Blue line print.; March 1978.; Hand annotated in red ink to show High altitude photography (HAP) sectors for photography in 1977 and 1979 with nota... The Center.
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1979. Tolen, James R. Modified from Regional Geologic Map Series, Indiana Geological Survey.' Includes insets of 'Thickness of unconsolidated materials' and 'Distributio... The Survey.
1979. Eggert, Donald L., cartographer. December 1979. Scale approximately 1:380,000. Indiana Geological Survey.
1979. Cooperative Forest Management.; CFM 112.; Index to Indiana service foresters by district on verso. Scale not given. The Division.