All photos published on this site are in the public domain.
There are no restrictions on using these photos, you are not mandatory to mention this website however it is highly appreciated if you do.
I also like to ask those who are thinking about uploading these photos as paid downloads to reconsider. There lays a beauty in sharing a legacy, let’s spread the word on this beautiful legacy, embrace the public domain and make history accessible for everyone.
For more info on copyrights for old potos please visit this page for US and this page for Europe.