Columbia subject headings:
Great Plains--History.
Historians--United States--Biography.
Mississippi River Valley--History.
Webb, Walter Prescott, 1888-1963.
Webb, Walter Prescott, 1888-1963. Great Plains.
Harvard subject headings:
Great Plains--History.
Historians--United States--Biography
Mississippi River Valley--History.
Webb, Walter Prescott, 1888-1963.
Webb, Walter Prescott, 1888-1963. Great Plains.
Princeton subject headings:
Great Plains--History.
Historians--United States--Biography.
Mississippi River Valley--History.
Webb, Walter Prescott, 1888-1963.
Webb, Walter Prescott, 1888-1963. Great Plains.