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PSM V84 D422 Desert laboratory tucson arizona.jpg

The desert laboratory, Tucson, Arizona.

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Author: Uncredited; D. T. MacDougal
Attribution: D. T. MacDougal: The measurement of environic factors and their biologic effects. The Popular science monthly, Volume 84, p418 . New York, Popular Science Pub. Co., May 1914. Online: archive.org .
License: Public domain
Source: https://commons.wikimedia.org/wiki/File:PSM_V84_D422_Desert_laboratory_tucson_arizona.jpg