Geological mapping and description of the Devonian and Silurian bedrock intervals within the Freeburg 7-1/2' Quadrangle around Freeburg and Kreamer, Snyder County, Pennsylvania.

MacLachlan, D. B, Hoskins, D, M and Payne, D. F. (1995) Bedrock geology of the Freeburg 71/2' quadrangle, Snyder County, Pennsylvania. Pennsylvania Geological Survey, Open-File Report 95-04.