Irrigation system maintenance, groundwater quality, and improved productionJohn S. Selker · First published 2004Open the Tome
Pesticides in southern Willamette Valley groundwaterJohn S. Selker · First published 2004Open the Tome
Vadose zone processesJohn S Selker, John S. Selker, James T. McCord, C. Kent Keller · First published 1999Open the Tome
