Biodiversity Heritage Library
By "Baldwin, Mark. "
Soil survey of the middle Gila Valley area, Arizona /
By: Eckmann, E. C. - Baldwin, Mark. - Carpenter, E. J. - United States. Bureau of Soils. - United States. Dept. of Agriculture.
Publication info: Washington :Govt. Print. Office,1920.
Holding Institution: University of California Libraries (archive.org)