Soil survey of Plymouth County, Iowa
By: by D.S. Gray and A.L. Gray.
Contributors: Gray, A. L. b. 1898.; United States. Bureau of Chemistry and Soils.; Iowa Agricultural Experiment Station.
Publisher: Government Printing Office
Published: 1928
Place of publication: Washington, D.C
Language: eng
Number of pages: 821
Subjects: Soils -- Iowa -- Plymouth County -- Maps.; Soil surveys -- Iowa -- Plymouth County.
Genres: Maps.
Notes: United States Dept. of Agriculture, Bureau of Chemistry and Soils, in cooperation with the Iowa Agricultural Experiment Station.

Advance sheets -- Field operations of the Bureau of Soils, 1923.