The statistical and spatial evaluation of sulfur and ash in coal seams /
by Manuel Gomez, Donald J. Donaven, and Kathleen Hazen.

APA Citation

Gomez, M., Hazen, K., Donaven, D. J., United States. Division of Mine Systems Engineering., United States. Bureau of Mines. (1972). The statistical and spatial evaluation of sulfur and ash in coal seams. [Washington, D.C.]: U.S. Dept. of Interior, Bureau of Mines.

MLA Citation

United States. Bureau of Mines, et al.. The Statistical And Spatial Evaluation of Sulfur And Ash In Coal Seams. [Washington, D.C.]: U.S. Dept. of Interior, Bureau of Mines, 1972.