The pre-Illinoian Pleistocene geology of Iowa
By: by George F. Kay and Earl T. Apfel.
Contributors: Apfel, Earl T. 1892-
Published: 1929
Place of publication: [Des Moines?]
Language: eng
Number of pages: 304
Subjects: Geology, Stratigraphic -- Pleistocene.; Geology -- Iowa.
Notes: "History of the investigations and classifications of the Pleistocene deposits of Iowa", by G.F. Kay (p. [70]-133) was published separately in 1928.

"Reprinted from Iowa Geological survey, v. 34, Annual report for 1928."

E.T. Apfel's thesis - University of Iowa, 1926.