[054-18]Characteristics and Implications of a Thin Loess Area in Northwestern Illinois
Ray, Burton W. and Watters, Paul S. Characteristics and Implications of a Thin Loess Area in Northwestern Illinois 054-18-print
[061-40] Fossil Musk Oxen of Illinois
Ray, Clayton E, Donald L. Wills, and John C. Palmquist Fossil Musk Oxen of Illinois 061-40-print