‘Natural’ historical pictures (exact matches)

Niagara Falls: Dixon crossing the Niagara River on a Tight-Rope
Niagara Falls: Dixon crossing the Niagara River on a Tight-Rope
Niagara Falls: The Milling District
Niagara Falls: The Milling District
Niagara Falls: An Ice Mountain at the Foot of American Fall
Niagara Falls: An Ice Mountain at the Foot of American Fall
Niagara Falls: Niagara Falls in Winter
Niagara Falls: Niagara Falls in Winter
Niagara Falls: A Winter Scene in Prospect Park
Niagara Falls: A Winter Scene in Prospect Park
Niagara Falls: Terrapin Rock in Winter
Niagara Falls: Terrapin Rock in Winter
Niagara Falls: Prospect Point in Winter
Niagara Falls: Prospect Point in Winter
Niagara Falls: Ice Formation
Niagara Falls: Ice Formation