Columbia subject headings:
Callahan, Harry M.
Photographers--United States--Biography.
Photography, Artistic.
Harvard subject headings:
Callahan, Harry M.
Callahan, Harry M.--Exhibitions.
Museum of Modern Art (New York, N.Y.)--Exhibitions.
Photographers--United States--Biography
Photographers--United States--Exhibitions.
Photography, Artistic
Photography, Artistic--Exhibitions
Photography, Artistic.
Princeton subject headings:
Callahan, Harry M.
Photographers--United States--Biography.
Photography, Artistic.