TY  - BOOK
T1  - A simple contouring program for gridded data
DA  - 1990.
CY  - Reston, Va. :
CY  - Denver, Colo. :
AU  - Harbaugh, Arlen W.
VL  - 90-144
CN  - I 19.76:
PB  - U.S. Geological Survey ;
PB  - Books and Open-File Reports Section [distributor],
PP  - Reston, Va. :
PP  - Denver, Colo. :
PY  - 1990.
ID  - 263403
KW  - Groundwater flow
TI  - A simple contouring program for gridded data
ER  -