The Digital Data Series encompasses a broad range of
digital data, including computer programs, interpreted
results of investigations, comprehensive reviewed data
bases, spatial data sets, digital images and animation,
and multimedia presentations that are not intended for
printed release. Scientific reports in this series cover a
wide variety of subjects on all facets of U.S. Geological
Survey investigations and research that are of lasting
scientific interest and value. Releases in the Digital Data
Series offer access to scientific information that is
available in digital form; the information is primarily for
viewing, processing, and (or) analyzing by computer
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