Drawings and correspondence re. mill conversion projects: Stamford Bridge Mill, Yorkshire; Paines Flour Mill, St Neots; Swaffham Prior smockmill. Dutch steel windmill sail stock blueprints. Report 'An investigation into the failure of a steel windmill stock'. SPOOM list of UK mills. Information on flour dust causing asthma. Printouts of North Yorkshire and Norfolk site and monument records.
Black and white photographs and 35mm slides depicting windmills in 17 UK counties. Field notes, windmill descriptions, magazine articles and cuttings, original text and photos for the County Windmills series, correspondence.
Material on Portuguese mills from the Associação Portuguesa de Amigos dos Moinhos (Portugese Association of Friends of Mills). See individual catalogue entries for further details on 2004 donation. 2014 donation includes: Portugese magazine "Turismo" with article on mills; Portugese brochure "Moinhos de Portugal"; photos of mills; APAM documents.
35mm slides. Reports. Press cuttings scrapbook, unknown creator. Folder containing photocopied correspondence between Rex Wailes and Thomas Hennell, and Alan Stoyel's research for Thomas Hennell book. Album of negatives of windmills, unknown creator.