Geology and mineral resources of the Dixon quadrangle - Knappen, Russell Stafford, 1892- (Urbana, Ill. [Schnepp & Barnes, printers, Springfield], 1926)
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.
Keywords: Geology -- Illinois -- Lee County; Geology -- Illinois -- Ogle County; Mines and mineral resources -- Illinois -- Lee County; Mines and mineral resources -- Illinois -- Ogle County