TY - BOOK AU - Kalkhoff, Stephen J. AU - Kuzniar, Ronald L. CN - I 19.76: CY - Iowa City, Iowa : CY - Denver, CO : DA - 1991. ID - 200779 KW - Hydrology KW - Agricultural chemicals KW - Water quality N1 - Distributed to depository libraries in microfiche. N1 - Shipping list no.: 92-0531-M. PB - U.S. Geological Survey ; PB - Books and Open-File Reports [distributor], PP - Iowa City, Iowa : PP - Denver, CO : PY - 1991. T1 - Hydrologic data for the Big Spring basin, Clayton County, Iowawater year 1989 / TI - Hydrologic data for the Big Spring basin, Clayton County, Iowawater year 1989 / ER -