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[edit] Summary

U.S. Geological Survey U. S. Geological Survey Mapping in the 20th Century www.usgs.gov/.../lewisandclark/1900timeline.html

[edit] Licensing

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.

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