Public domain
Science and research. Studies of non-coking coals. Research workers at the Golden, Colorado field station of the U.S. Bureau of Mines at a fifty-pound coke oven, which is used to determine if an unknown coal has coking properties. Coal is tested at various temperature levels to determine its adaptab
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Credit lineScience and research. Studies of non-coking coals. Research workers at the Golden, Colorado field station of the U.S. Bureau of Mines at a fifty-pound coke oven, which is used to determine if an unkno. 1942-01-01. United States. Office Of War Information, Feininger, Andreas. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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