Gray, Floyd

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Processed Thematic Mapper satellite imagery for selected areas within the U.S.-Mexico borderlands

The passage of the North American Trade Agreement (NAFTA), establishment of the Border Environmental Cooperation Commission as well as the EPA U.S./Mexico Border XXI Program has focused attention to the environmental social-cultural, and economic conditio

Geology and resource assessment of the Venezuelan Guayana Shield at 1:500,000 scale

The data in this CD-ROM are based on a mineral resource assessment of the Venezuelan Guayana Shield, conducted between 1987 and 1991 by the U.S. Geological Survey and Corporaci—n Venezolana de Guayana, TŽcnica Minera, (USGS, 1993). The Venezuelan Shiel