Columbia subject headings:
Petroglyphs--United States--Pictorial works.
Photography of art.
Rock paintings--United States--Pictorial works.
Harvard subject headings:
Petroglyphs--United States--Pictorial works.
Photography of art.
Rock paintings--United States--Pictorial works.
Princeton subject headings:
Petroglyphs--United States--Pictorial works.
Photography of art.
Rock paintings--United States--Pictorial works.