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SSI Resources
An Occurrence and Distribution Survey of Expansive Materials in the United States by Areas
FHWA Report FHWA-RD-76-82 PB76-265230/AS, by D. M. Patrick and D. R. Snethen, Interim Report 1976. This report cncludes a study of physiographic areas within the continental United States which contain sources of potential expansive materials.
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