[096-16MS2305] Pre-Historic Man-created Bedrock Holes of the Eastern Shawnee Hills, Southern Illinois
Schwegman, John E. Pre-Historic Man-created Bedrock Holes of the Eastern Shawnee Hills, Southern Illinois 096-16MS2305-print
Schwegman, John E. Pre-Historic Man-created Bedrock Holes of the Eastern Shawnee Hills, Southern Illinois 096-16MS2305-print