na INLIS000000000002475 Ind 0010-1118002475 Loess thickness and its effect on soils in Illinois FEHRENBACHER, J.B. by J.B. Fehrenbacher; I.J. Jansen and K.R. Olson Illinois University of Illinois 1986 14 p. : ill. ; 28 cm.-- 14 p. : ill. ; 28 cm.-- Bibl. p. 13-14 551.311.33(773) LOESS SOILS ILLINOIS 746/MS/88