IMSLP Forums

http://www.bbc.com/news/technology-28976849
https://www.flickr.com/photos/interneta ... 784850762/

See the BBC article above for more info. The person's script is picking up quite a few pieces of music in the internet archive. This may be a more visual way to find some of it for adding here. It's fun looking through the picture nonetheless.

Does the Internet Archive still have scores that imslp hasn't ? (relying on the search results I obtain there)

Yes, there are still libraries actively adding musical scores to the Internet Archive. Perhaps the most notable among them are the Canadian universities and the Boston Public Library system.