Any and all material related to Russell's newspaper sermons and their syndication.
Biographical material concerning M. F. Russell, even if you think we probably have it.
There were numbers of booklets published about the 1881 speculation. Only one of them was published by the Watch Tower, but we're interested in all of them. We aren't interested in the Mother Shipton booklets unless they cover a wider field than the fake Shipton prophecy.
We need Paton's private letters. (Probably wishful thinking.)