Natural resources and geological surveys
Series: Illinois State Geological Survey. Circular -- no. 174; Circular (Illinois State Geological Survey) -- no. 174.; Circular (Illinois State Geological Survey) -- 174.
Published: 1951
Place of publication: Urbana
Language: eng
Number of pages: 577
Subjects: Geological surveys; Geology
Notes: "Reprinted from Economic geology, vol. 46, no. 6, pp. 563-577, September-October, 1951."

Bibliography: p. 576-577.