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Established by an Act of Congress in 1879 and charged with responsibility for "classification of the public lands
and examination of the geological structure, mineral resources, and products of the national domain," the U. S. Department
of the Interior's Geological Survey has been the Nation's principal source of information about its physical resources
the configuration and character of the land surface, the composition and structure of the underlying rocks, and the quality,
extent, and distribution of water and mineral resources.
Click on the state to view list of quadrangles 
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