Information Circular 86
	Quality of gravel resources in northwestern Pennsylvania by Craft, J. L. 1979
Suggested Citation:	Craft, J. L., 1979, Quality of gravel resources in northwestern Pennsylvania: Pennsylvania Geological Survey, 4th ser., Information Circular 86, 54 p. [Available online.]
Description:	This information circular covers the sources, composition, and quality of natural gravels in northwestern Pennsylvania. Detailed information is given on how to evaluate the suitability of gravel for construction aggregate; associated freeze-thaw tests and analyses of test data are provided.
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