Analyses of ash from coals of the United States /
by W.A. Selvig and F.H. Gibson.

APA Citation

Selvig, W. A. (Walter Alfred)., Gibson, F. H. (Francis Harold). (1945). Analyses of ash from coals of the United States. Washington: U.S. G.P.O..

MLA Citation

Selvig, W. A. (Walter Alfred), 1886-1972, and F. H. (Francis Harold) Gibson. Analyses of Ash From Coals of the United States. Washington: U.S. G.P.O., 1945.

Warning: These citations may not always be complete (especially for serials).