The purchase of coal under government and commercial specifications on the basis of its heating value, with analyses of coal delivered under government contracts - Randall, Dwight T. (Washington : Govt. Print. Off., 1908)
Subject series: Q, Fuels, 10.
Issued also as House doc. no. 734, 60th Cong., 1st sess.
"Some publications on coal": p. 27.
Keywords: Coal; Coal -- Testing