The clays of the United States east of the Mississippi river

von Ries, Heinrich, 1871-1951
Professional paper (Geological Survey (U.S.)) no. 11.
Washington, D.C. : Govt. print. off., 1903.
Umfang/Format: 298, ii p., 1 l. : ill., IX plates (incl. 5 maps) ; 29 cm.