01387cam a22003251 4500 gs 27000129 DLC 20260227111331.0 780204s1926 xx 000 0 eng c gs 27000129 (OCoLC)3603441 Library, U.S. Geological Survey OT TxU OCoLC DLC premarc QE105 .A16 no. 49 Knappen, Russell Stafford, 1892- Geology and mineral resources of the Dixon quadrangle, by Russell Stafford Knappen. Urbana, Ill. [Schnepp & Barnes, printers, Springfield] 1926. 141 p. incl. illus., tables. V pl. (fold. maps, part col.) 26 cm. Illinois. State geological survey. Bulletin no. 49 At head of title: State of Illinois. Department of registration and education. Division of the State geological survey. Published also as thesis (Ph. D.) Columbia university, 1927. Plates I-II folded in pocket. Bibliographical references. Geology Illinois Lee County. Geology Illinois Ogle County. Mines and mineral resources Illinois Lee County. Mines and mineral resources Illinois Ogle County. Dixon quadgrangle. Bulletin (Illinois State Geological Survey) ; no. 49. 26554 26554