00873cam a22002291 4500 gs 29000068 DLC 20260227111333.0 820714s1929 ilu 000 0 eng c gs 29000068 (OCoLC)8599483 U. S. Geol. Survey. Libr. GStG IDeKN OCoLC DLC QE105 .A3 no.2 Rolfe, Deette, 1879- The Rock River country of northern Illinois, by Deette Rolfe. Urbana, Ill. [Springfield Jeffersons Printing & Stationery Co.] 1929. [58], [1] p. incl. front. illus., maps. 20 cm. Illinois State Geological Survey. Educational series, no. 2 At head of title: State of Illinois. Department of Registration and Education. Bibliography: p. [59] Geology Illinois Rock River Valley. 26701 26701