1900
Keystone View Co., 1905
Keystone View Co., 1892
Keystone View Co., 1930
Keystone View Co., 1900
Keystone View Co., 1937
Keystone View Co., 1915
Keystone View Co., 1932
![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)
![[Men hauling sacks from ship to dock]](https://media.getty.edu/iiif/image/f30bf319-9c44-4d3e-af66-b7fe90bd7077/full/843,/0/default.jpg)
