Curated OER
Educational Technology Clearinghouse: Maps Etc: Arizona Highlands, 1911
A map from the U.S.Geological Survey Camelback quadrangle (1911) showing the waste-bordered mountains of the Arizona Highlands. The text notes the lack of a permanent stream, the large number of intermittent streams as shown by the...
Curated OER
Educational Technology Clearinghouse: Maps Etc: Colorado Front Range, 1911
A map from 1911 of a portion of the Front Range in Colorado north of Denver showing the geologic feature of cross folding 'en echelon’, (short linear features that overlap in a line running obliquely to the strike of the individual...
Curated OER
Etc: Maps Etc: Swamp Lands of the United States, 1911
A map from the 19th Annual Report of the U.S. Geological Survey (1898) showing areas of swamp and marsh lands in the United States at the time, with degrees of swampiness shown in two shadings.
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