TY  - BOOK
AU  - Ries,Heinrich
AU  - Somers,Ransom Evarts
TI  - The clays of the Piedmont Province, Virginia,
T2  - Virginia. Geological survey. Bulletin
AV  - QE173 .A2 no. 13
PY  - 1917///
CY  - Charlottesville
PB  - University of Virginia
KW  - Clay
KW  - Virginia
ER  -