Nursery Practice for Trees and Shrubs Suitable for Planting on the Prairie-plains: Issues 431-434; Issue 436

Predicting Rainfall-erosion Losses from Cropland East of the Rocky Mountains: Guide for Selection of Practices for Soil and Water Conservation, Issues 277-289

Official Changes in the Active List of Permissible Explosives and Blasting Devices for August, 1930: 1930-1931