A working erosion model for schools
By: Don Carlos Ellis
Contributors: Ellis, Don Carlos
Series: USDA Office of Experiment Stations Circular -- 117; Circular (United States. Office of Experiment Stations) -- 117.
Publisher: United States Government Printing Office
Published: 1912
Place of publication: Washington, D.C
Language: eng
Number of pages: 11
Subjects: Agricultural experiment stations; Erosion; Education; Periodicals; Agriculture
Notes: Cover title.