Distribution of minor elements in coals of the Appalachian region /

by Zubovic, Peter, 1915-, Stadnichenko, Taisia, 1894-1958, Sheffey, Nola B., 1929-1996
Washington, [D.C.] : United States Government Printing Office, 1966

Geochemistry of minor elements in coals of the northern Great Plains coal province /

by Zubovic, Peter, 1915-, Stadnichenko, Taisia, 1894-1958, Sheffey, Nola B., 1929-1996
Washington, D.C. : U.S. G.P.O., 1961

Distribution of minor elements in coal beds of the eastern interior region /

by Zubovic, Peter, 1915-, Stadnichenko, Taisia, 1894-1958, Sheffey, Nola B., 1929-1996
Washington, [D.C.] : United States Government Printing Office, 1964