Columbia subject headings:
Agriculture--United States--Pictorial works.
Agriculture--United States.
Farms--United States--Pictorial works.
Farms--United States.
United States--Pictorial works.
Harvard subject headings:
Agriculture--United States
Agriculture--United States--Pictorial works.
Farms--United States--Pictorial works.
Farms--United States.
United States--Pictorial works.
Princeton subject headings: