Columbia subject headings:
Big Bend Region (Tex.)--History.
Cattle trails--Texas.
Harvard subject headings:
Big Bend Region (Tex.)--Biography.
Big Bend Region (Tex.)--History.
Cattle trails--Texas--Big Bend Region--History.
Cowboys--Texas--Big Bend Region.
Ranch life--Texas--Big Bend Region--History.
Smithers, W. D. (Wilfred Dudley), 1895-1981.
Princeton subject headings: