Columbia subject headings:
Canada--Pictorial works.
Nature photography.
Northwest Passage--Pictorial works.
Harvard subject headings:
Arctic regions--Pictorial works.
Itasca (Ship)
Ketchum, Robert Glenn--Exhibitions.
Ketchum, Robert Glenn.
Nature photography
Northwest Passage--Pictorial works.
Princeton subject headings:
Itasca (Ship)
Ketchum, Robert Glenn.
Nature photography.
Northwest Passage--Pictorial works.