Smithsonian Report, 1948.—Gabrielson PLATE 2 
1. The dust storms of the 1930’s focused attention on some of our basic problems. 
Photograph by Pathe News, from Underwood and Underwood. 
7 ee 
2. Erosion has hastened reduction of soil fertility far more than any other 
factor. 
Photograph by Soil Conservation Service. 
