At head of title: U.S. Department of commerce. R. P. Lamont, secretary. Bureau of mines. Scott Turner, director.Bibliography: p. 54-62.Mode of access: Internet
At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, ...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
At head of title: Department of commerce. Herbert Hoover, secretary. Bureau of mines. D. A. Lyon, ac...
At head of title: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: Dept. of the interior-U.S. Geological survey.Extracted from Mineral resources of t...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
At head of title: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: Department of Commerce. R.P. Lamont, secretary. Bureau of Foreign and Domestic Com...
At head of title: Dept. of the interior.Bibliography: p. 20-33.Mode of access: Internet
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...
At head of title: U.S. Dept. of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, dir...
At head of title: United States Department of the interior. Harold L. Ickes, secretary. Bureau of mi...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
"Removal of petroleum coke from Dubbs stills, by L.A. Mekler": p. 28-29.At head of title: U.S. Depar...
At head of title: U.S. Department of commerce, Henry A. Wallace,secretary. National bureau of Standa...
At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, ...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
At head of title: Department of commerce. Herbert Hoover, secretary. Bureau of mines. D. A. Lyon, ac...
At head of title: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: Dept. of the interior-U.S. Geological survey.Extracted from Mineral resources of t...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
At head of title: U.S. Department of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner...
At head of title: Department of Commerce. R.P. Lamont, secretary. Bureau of Foreign and Domestic Com...
At head of title: Dept. of the interior.Bibliography: p. 20-33.Mode of access: Internet
At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Sco...
At head of title: U.S. Dept. of Commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, dir...
At head of title: United States Department of the interior. Harold L. Ickes, secretary. Bureau of mi...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
"Removal of petroleum coke from Dubbs stills, by L.A. Mekler": p. 28-29.At head of title: U.S. Depar...
At head of title: U.S. Department of commerce, Henry A. Wallace,secretary. National bureau of Standa...
At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, ...
At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Bureau of mines. Scott Turner...
At head of title: Department of commerce. Herbert Hoover, secretary. Bureau of mines. D. A. Lyon, ac...
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