A Reevaluation of the "Illinoian till plain" and the origin of the gritty loess substratumof Avonburg and Clermont soils in southeastern Indiana by E. E. Gamble ... [et al.]. - Washington Soil Conservation Service 1990. - viii, 109 p. ill. LCCN: tlc00030173 Subjects--Topical Terms: Soils--Indiana. GPO Item No.: 0121-A Gov. Doc. Class. No.: A 57.52:41