Columbia subject headings:
United States--Description and travel.
Harvard subject headings:
Steinbeck, John, 1902-1968--Journeys--United States.
Steinbeck, John, 1902-1968--Travel--United States.
United States--Description and travel.
Princeton subject headings:
Steinbeck, John, 1902-1968--Travel--United States.
United States--Description and travel.