Geologic structure map of the northwestern Illinois zinc-lead district
By: by J. C. Bradbury, R. M. Grogan [and] R. J. Cronk.
Published: 1956
Place of publication: Urbana
Language: eng
Subjects: Geology, Structural.; Geology -- Illinois.; Geology -- Maps.
Genres: Maps.
Notes: Bibliography: p. 7.
Cover title.