913 resultados para hard hats
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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"United States Department of Agriculture in cooperation with the State Agricultural Experiment Stations in Colorado, Iowa, Kansas, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming."
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Mode of access: Internet.
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Saline Valley Farms was an experiment in cooperative farming and living begun in 1932 by Harold S. Gray.
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3rd row, 3rd from left = Kenneth Russell Smoot; 2nd row, 3rd from right = Frederick Somers Bell