00943cam a22002651 4500 agr42000134 DLC 20260227111000.0 950816s1941 dcua 000 0 eng agr42000134 (OCoLC)34642808 DLC NNC OCoLC DLC S623 .U44 no. 22 Mortlock, Harry Crawford, 1892- Erosion and related land use conditions on the Box elder creek project, Nebraska, by H. C. Mortlock ... and R. D. Greenawalt ... Box elder creek project, Nebraska [Washington, U.S. Govt. print. off., 1941] 34 p. illus., maps. 26 cm. U. S. Soil conservation service. Erosion survey no. 22 7 fold. maps in pocket. Land use Nebraska. Soil conservation Nebraska. Greenawalt, Ross Dilworth, 1906- Erosion survey no. 22 10180 10180