Element Concentrations in Soils and Other Surficial Materials of the Conterminous United States

An Account of the Concentrations of 50 Chemical Elements in Samples of Soils and Other Regoliths

by Einar Bartlett Ekren, Hansford T. Shacklette, Theodore J. Armbrustmacher, Tor Helge Nilsen, William Aubrey Cobban, David H. McIntyre, Josephine G. Boerngen, Earl H. Bennett · 1984