• GB235 JJT/1: Index to Botanical References & Publications – Foolscap Book “Army Book 72”: alphabetical indexed ledger, ms. entries and ms. and typescript loose sheets (includes ms. notes to RK, William Wright Smith, on botanical references, and typescript note from W. W. Smith, 1931–1937,) 1927. Index includes lists of bibliographic references to monographs and scholarly journals, with 6 pp. listing County Reports of Scotland (1794 to 1814) and England (1794 to 1815).
• GB235 JJT/2: “Index to Rhododendrons & Primulas”: alphabetical indexed ledger, ms. entries and ms. and typescript loose sheets (includes misc. plant notes, typescript List of Works on Primulas, and ms. list of rhododendrons), 1923.
• GB235 JJT/3: “Index to Scottish Botanists” in “The Portland Letter File”: alphabetical indexed ledger, with ms. loose sheets, Note inserted in file: “It is quite possible that this was compiled by Mr J T Johnstone, RBG Librarian. DMH [Douglas Henderson], 1973.”
Above material, apparently prepared and used as personal reference source by J. T. Johnston, Librarian of RBGE 1912-46 and are filed under “Johnston, J.T. (Librarian)” – in individual box