TY  - BOOK
T1  - Management systems evaluation area, Iowa - Walnut Creek watershed
DA  - 1992.
CY  - [Washington] :
VL  - 92-167
CN  - I 19.76:
PB  - U.S. Geological Survey, Dept. of the Interior,
PP  - [Washington] :
PY  - 1992.
N1  - Caption title.
N1  - Distributed to depository libraries in microfiche.
N1  - Shipping list no.: 93-0957-M.
ID  - 199806
KW  - Water quality
KW  - Agricultural chemicals
TI  - Management systems evaluation area, Iowa - Walnut Creek watershed
ER  -