Image: Oil Shale Retorts Nevada
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Description: Oil shale retorts, Nevada, 1922
Title: Oil Shale Retorts Nevada
Credit: Oil Shale: An Historical, Technical, and Economic Study, US Bureau of Mines, Bulletin 210, 1922, Plate 17
Author: Marvin J. Gavin
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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