Columbia subject headings:
Agriculture--Great Plains--History.
Agriculture--Southwestern States--History.
Depressions--1929--United States.
Dust storms--Great Plains.
Dust storms--Southwestern States.
Great Plains--History.
Southwestern States--History.
Harvard subject headings:
Princeton subject headings:
Agriculture--Great Plains--History--20th century.
Agriculture--Southwestern States--History--20th century.
Depressions--1929--United States.
Dust storms--Great Plains--History--20th century.
Dust storms--Southwestern States--History--20th century.
Great Plains--History.
Southwestern States--History.