Notebook measuring approx. 10.5 cm x 16.5 cm and marked on the inside cover 'c.1972' containing a list of mills (one page per mill), at varying levels of detail (those with more content being listed at 'Place access points' below). The first half of the notebook is devoted to watermills but the second half features windmills (mostly smock and post mills). Notes on several of the windmills reference the work of JM Heathcote. Cross references to maps/page numbers of books occur throughout.

A repurposed pocket diary for August 1931 measuring 6.5 cm x 9 cm and marked "Kent" with brief notes on, and/or references to, the mills listed at "Place access points" below. The notebook is only partially complete.

A repurposed Army field message book labelled, "Bozeat, Kibworth Harcourt, Halnaker, Outwood" comprising research notes, drawings and measurements from visits to the following mills: Bozeat Mill on 25 March 1932 (8 pages); Moreton Mill on 20 June 1932 (8 pages); Kibworth Harcourt on 28 May 1933 (14 pages - including notes of old inscriptions, "Daniel Hutchinson Miller 1711" and "William Fellow 1794"); Halnaker Mill examined on 12 December 1933 with Sir William Bird (3 pages); The Old Mill, at Cornwall Road, Buxton on 22 June 1934 (7 pages and referencing Joshua Ashby & Sons); notes about Outwood post mill (4 pages); "Pure White Laundry, Toot[ing]" on 27 June 1934 (2 pages); further pages of assorted notes including an extract from an 1817 account of money expended at Halnaker Mill (13 pages).

Album of negative strips in various sizes, of windmills and watermills, views of London, and the 1968 SPAB Spring Mill Tour. The following mills are listed: Post mill, Bourn; Cattell's Mill, WiIllingham; Tower mill, Over; King's Mill, Shipley; Wicken Fen Mill, Wicken Fen; Watermill, Wroughton; Abbey Mill, Reading; Smock mill, Willesborough; Lower Mill, Woodchurch; Shepherd Wheel, Porter, Sheffield; Abbeydale Hamlet, Sheffield; Post mill, Ramsey; Outwood Post Mill, Outwood; Ashton Mill, Chapel Allerton; Stratford Mill, Blaise Castle Estate, Henbury.

Negatives of smock, tower and post mills and watermills in Kent, Surrey and Sussex. Only 48 of the 100 negatives have been labelled by Stephen, and of those 34 are mill related. The remaining 52 negatives also contain images of mills which are likely to be those described in Mill Research Notebook 27a.

Negatives of smock, tower and post mills and watermills in Kent, Surrey, Cambridgeshire and Huntingdonshire.