The clays and shales of Virginia west of the Blue ridge,
Ries, Heinrich, 1871-1951.
The clays and shales of Virginia west of the Blue ridge, by H. Ries and R. E. Somers. - Charlottesville, University of Virginia, 1920. - vii, 3, 118 p. illus., XIV pl. (incl. map in pocket) tables, diagrs. 26 cm. - Virginia. Geological survey. Bulletin no. 20 .
At head of title: Virginia Geological survey. University of Virginia. Thomas Leonard Watson, director.
gs 21000073
Clay--Virginia
Shale
QE173 / .A2 no. 20
557.55
The clays and shales of Virginia west of the Blue ridge, by H. Ries and R. E. Somers. - Charlottesville, University of Virginia, 1920. - vii, 3, 118 p. illus., XIV pl. (incl. map in pocket) tables, diagrs. 26 cm. - Virginia. Geological survey. Bulletin no. 20 .
At head of title: Virginia Geological survey. University of Virginia. Thomas Leonard Watson, director.
gs 21000073
Clay--Virginia
Shale
QE173 / .A2 no. 20
557.55