A repurposed Seandar diary for 1925 measuring 9.5 cm x 15 cm recording an 8 day tour of windmills, most of which located in Cambridgeshire. Planning notes for the trip list mills to be visited each day (as well as recommended inns in which to dine/stay).
Notes are made for the mills listed in 'Place access points' below, occasionally accompanied with dimensions and drawings. Mills which have been demolished are also recorded. A list of those mills not visited is given at the back.
Unindexed mills visited include Polton Mill, Shepreth End post mill, a tower mill at Bradley and the remains of tower mills at Chesterton, Boxworth and March.
Mills at Histon, Waterbeach, Yelling, Fen Drayton, Somersham, Warboys, Susards Farm, Madingley and St John's Highway are marked 'non-est'.

3 identical 'Kirby Series' Reporters Books, each 160 pages, containing Wailes' research and manuscript for 'The Windmills of Suffolk'.

A repurposed Army field message book (without its cover) labelled, 'Chinnor & (contains all sketches & rough notes of) Llandeusant Mill, Anglesey, Saughall'. The contents include: a narrative description of the post mill at Chinnor, describing its post as, 'the smallest I have ever seen', notes also being made about 'Great Hazeley Mill' (7 pages); detailed notes, drawing and measurements on 'Saughall mill' following an inspection on 4 March 1933 (20 pages); intricate drawings, measurements and notes about Llanddeusant water mill (33 pages).
The notebook also contains detailed notes relating to some sort of printing or photographic process and a pinned memo to 'call at W.H. for fiddle' [a possible reference to Enid Wailes' violin].

A repurposed Army field message book labelled, "Tide [and] Cider Mills, Woad Cart, Sprowston" containing research notes, drawings and measurements taken from visits in 1932 to the identifiable post and tower mills listed at "Place access points" below.
The notebook also contains: 5 pages of notes extracted from "The Miller's Guide", R.R. Smith, London, William Butcher, 1875; 4 pages of notes following a visit to a cider mill at St Keynes, Cornwall, 2 July 1937; 24 pages of notes and drawings labelled, "Woad Farm, Boston, 2 August 1937"; in the rear pocket, two postcards addressed to Wailes, one of which is from H.W. Dickinson, Honorary Secretary of The Newcomen Society , referencing tide and cider mills.

A repurposed Army field message book labelled, "Various notes should be transcribed. Gt Hazely, Ramsey, Ivinghoe" and comprising research notes, drawings and measurements from visits to the identifiable mills listed at "Place access points" below. Ivinghoe is more commonly known as 'Pitstone Windmill', Wailes noting a date of 1627 carved in part of the interior.

A Reporters' Notebook containing:
Northants: notes taken from 'Northants Notes & Queries, New Series, Vol.4, 1912-1920' relating to: a 1609 grant by James 1 of a post mill at Kettering; the history of an unindexed tower mill (located on the site of a former post mill on Rockingham Road, Kettering) which was demolished in 1893; 18th c. maps of Kettering showing the location of various mills and a 19th c. print showing a post mill at Peterborough; also notes about the post mill at Seaton, Rutland which was demolished in 1917 as well as the nearby watermill, Henry Royce being said to have worked at both mills as a boy.
Suffolk: research notes relating to Suffolk windmills including construction dates, operational status in 1926,1939 and 1955 and including the notable features listed in 'Subject access points' below.
Windmill restoration: eight pages of draft narrative rehearsing the demise of wind and watermills since the late 19th c. and extolling the efforts of John Russell to restore and preserve Union Mill, Cranbrook. The narrative rehearses the preservation efforts made by a number of local authorities (counties listed in 'Place access points' below) arguing that it should be essential for such work to be their responsibility.
Windmills still in operation: notes running from back-to-front in the notebook listing, 'How many still in use', which are 'Workable' and 'When used and why'.

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 Lett's diary for 1930 measuring 7.5 cm x 10 cm, most of the pages being blank, but containing a list of the Suffolk mills itemised at 'Place access points' below, with brief descriptions for each one. These include details of the current mill owner (where applicable) and their condition (or date of demolition, if applicable).

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).