TY  - BOOK
AU  - Swain, Lindsay A. 
TI  - Summary of the Hydrogeology of the Valley and Ridge, Blue Ridge and Piedmont Physiographic Provinces in the Eastern Unites States: Professional Paper 1422-A. 
PY  - 2004///
CY  - Reston, [Virginia]
PB  - U.S. Geological Survey
KW  - გეომორფოლოგია
ER  -