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.