TY  - RPRT
TI  - Hydrogeologic unit map of the Piedmont and Blue Ridge provinces of North Carolina
AU  - Charles C. Daniel
AU  - R.A. Payne
PY  - 1990
DO  - 10.3133/wri904035
UR  - https://pubs.usgs.gov/publication/wri904035
ID  - wri904035
ER  -