Columbia subject headings:
Harvard subject headings:
Cowboys--West (U.S.)--Pictorial works
Nicholson, Jon.
Ranch life--West (U.S.)--Pictorial works.
Ranchers--West (U.S.)--Pictorial works.
West (U.S.)--Social life and customs--Pictorial works.
Princeton subject headings:
Cowboys--United States--Pictorial works.