Williams, Allen L.; Rothert, Jane E.; McClure, Kent E.; Alofs, Darryl J.; Hagen, Donald E.; White, Daniel R.; Hopkins, A.R.; Trueblood, Max B.(Illinois State Water Survey, 1991)
Williams, Allen L.; Rothert, Jane E.; McClure, Kent E.; Alofs, Darryl J.; Hagen, Donald E.; Schmitt, John; White, Daniel R.; Hopkins, A.R.; Trueblood, Max B.(Illinois State Water Survey, 1992)