Free to use, no copyright restrictions. The piece was posted in 1788. Any piece before 1923 is free for public use, without infringement.
Restricted. It is post 1923, therefor falls under copyright. There is also a fine print at the bottom that states that the poster used the copyright owner’s permission to reproduce.
Unrestricted as it can be used for academic purposes.
Put together as a gathering of sources, unhindered by copyright.