Regional changes in corn production in the United States from 1909 to 1949.
Series: University of Chicago. Dept. of Geography. Research paper no. 40; Research paper (University of Chicago. Dept. of Geography) -- no. 40.
Published: 1955
Place of publication: Chicago
Language: eng
Number of pages: 78
Subjects: Corn -- United States
Notes: Thesis--University of Chicago.

Bibliography: p. 76-78.