Columbia subject headings:
Harvard subject headings:
Landscape photography--Niagara Falls (N.Y. and Ont.)
Niagara River (N.Y. and Ont.)--Description and travel.
Niagara River (N.Y. and Ont.)--Pictorial works.
Pfahl, John, 1939-2020
Princeton subject headings:
Landscape photography--Niagara Falls (N.Y. and Ont.).
Niagara Falls (N.Y. and Ont.)--Description and travel.
Niagara River (N.Y. and Ont.)--Description and travel--Views.
Niagara River (N.Y. and Ont.)--Description and travel.
Pfahl, John, 1939-