There is a good number of files in the Bibliography section listed in _Undone.txt which had not been added to RBIL by its last release. I would assume many of these files may no longer be available at the links provided. Hopefully, they may be available on the Internet Archive or found elsewhere.
I hope someone can start collecting them for the purpose of eventually integrating the information they contain into The List.
There is a good number of files in the Bibliography section listed in _Undone.txt which had not been added to RBIL by its last release. I would assume many of these files may no longer be available at the links provided. Hopefully, they may be available on the Internet Archive or found elsewhere.
I hope someone can start collecting them for the purpose of eventually integrating the information they contain into The List.