Columbia subject headings:
Historic buildings--Ontario--Niagara-on-the-Lake--Pictorial works.
Niagara-on-the-Lake (Ont.)--Buildings, structures, etc.--Pictorial works.
Niagara-on-the-Lake (Ont.)--History.
Harvard subject headings:
Historic buildings--Ontario--Niagara-on-the-Lake Region--Pictorial works.
Historic sites--Ontario--Niagara-on-the-Lake Region--Pictorial works.
Niagara-on-the-Lake Region (Ont.)--Pictorial works.
Princeton subject headings: