00828cam a22002411 4500 gs 17000415 DLC 20260227111321.0 780323s1917 vaubf 000 0 eng c gs 17000415 (OCoLC)3743350 Library, U.S. Geological Survey OT NSbSU DLC premarc QE173 .A2 no. 13 TN942 .R47 Copy 2. Ries, Heinrich, 1871-1951. The clays of the Piedmont Province, Virginia, by H. Ries and R. E. Somers. Charlottesville, University of Virginia, 1917. vi, [2], 86 p. XV pl. (incl. fold. map in pocket) 26 cm. Virginia. Geological survey. Bulletin no. 13 Clay Virginia. Somers, Ransom Evarts, 1885- joint author. 25793 25793