Government coal purchases under specifications : with analyses for the fiscal year 1909-10 / by George S. Pope ; with a chapter on the Fuel-inspection laboratory of the Bureau of mines, by Joseph D. Davis
At head of title: ... Department of the interior. Bureau of mines. Joseph A. Holmes, director. "This Bulletin is the fourth of a series showing the results of the purchase of coal by the government under specifications."--P. 5.