Geological Exploration of the Fortieth Parallel
- Geological Exploration of the Fortieth Parallel
The Geological Exploration of the Fortieth Parallel was a geological survey under the directorship of Clarence King established in 1867 by the US Congress, more commonly known as the Fortieth Parallel Survey. The survey conducted six years of field work exploring area along the fortieth parallel from western Nevada to eastern Wyoming. The results of the survey were published in eight volumes of the Fortieth Parallel Survey.
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