22 
BITLLETIK- 1348, U. S. DEPARTMENT OP AGRICULTtmE 
Fig. 22.— Over five-sixths of the crop land is in the humid eastern half of the United States, and nearly 
two-thirds is concentrated in the triangular-shaped area the points of which are located in western 
Pennsylvania, central Texas, and north-central North Dakota. In this area, which includes only 
about one-fourth of the land of the United States, are produced four-fiftlis of the corn, three-fourths 
of the wheat and oats, and three-fifths of the hay crop of the nation. (U. S. Dept. Agr. Yearbook 
1921.) 
