The clays of the Piedmont Province, Virginia,
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 .
gs 17000415
Clay--Virginia.
QE173 / .A2 no. 13
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 .
gs 17000415
Clay--Virginia.
QE173 / .A2 no. 13