There is a fairly large archive under the torrent crossref-pre-1909-scholarly-works, which contains pre-1909 works and is public domain. I didn't grab that one

There is a fairly large archive under the torrent crossref-pre-1909-scholarly-works, which contains pre-1909 works and is public domain. I didn't grab that one but it should be easy to find with any search engine. There is also lots on archive.org!