Thanks res. We have all that material. We have all the available publications including some not listed in most bibliographies. What I seek is the personal letters and papers of the principals. Not published material. I can't think of any material published before 1916 we do not have except for a few of the original Bible Students Tracts [1881]
We do not have some of the anti-Russell polemics. Those are useful too. We gave very few letters written by Russell, and most of those we have are not especially useful. However, sometimes an off handed comment is an otherwise bland letter contributes to our understanding.