Box 43 contains notes and documents from research for McClintock biopgrahy, inlcuding reprints, archive notes, and other publications by Kass.

Box 44 contains McClintock reprints and photocopies, Kass' notes for Companion Volume and biopgrahy

Box 45 contains correspondence, drafts, and scans for Companion Volume as well as rejected book proposals. See note in box from April 30, 2025.