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Based in Skokie, Ill., the Portland Cement Association represents cement companies in the United States and Canada. It conducts market development, engineering, research, education, and public affairs programs.

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USGS Mineral Resources Program Home Page: A source of unbiased information on the occurrence, quality, quantity, and availability of mineral resources. This website contains information about the Program, current activities, and products.

Martin Marietta Materials, Inc. is a leading producer of construction aggregates in the U.S., supplying granite, sandstone, limestone, sand and gravel for a wide range of infrastructure, commercial and residential applications. The company is also a ...

Zachry Corporation provides heavy and building construction, cement and aggregates, operations and maintenance and program management for public and private sectors