1905
Keystone View Co., 1930
Keystone View Co., 1900
Keystone View Co., 1901
Keystone View Co., 1937
Keystone View Co., 1920
Keystone View Co., 1890
Keystone View Co., 1898
Keystone View Co., 1905
Keystone View Co., 1915
Keystone View Co., 1892
![Modern Steel Plant along the Monongahela River, Pittsburg[h], Pa., U.S.A.](https://media.getty.edu/iiif/image/e1c94a4f-9cfd-4269-9545-99a8c91662e5/full/843,/0/default.jpg)
![[Washington] Irving's Grave, Sleepy Hollow, N.Y., U.S.A.](https://media.getty.edu/iiif/image/a9ca0339-2335-4ceb-bc09-65c08f1ee456/full/843,/0/default.jpg)
