Notes on Yorkshire, North Riding watermills. Also refers to the following mills: Old Bleach Watermill (Broughton), Castle Levington Stone Mill, Croft Watermill, Jolby Watermill (Croft), Pencil Watermill (Cronkley), Swinton Estate Sawmill (Healey), New Langthwaite Watermill, Deepdale Watermill (Lartington), Sandsend Cement Watermill (Lythe), Clow Beck Watermill (Manfield), Marrick Watermill, Masham Watermill, Middle-in-Teesdale Saw Mill, Northallerton Watermill, Cote Ghyll Watermill (Osmotherley), Beck Isle Museum (Pickering) Watermill, Reeth Watermill, Richmond Castle Watermill, Easby Abbey Watermill (Richmond), Rievaulx Abbey Blast Furnace, Rievaulx Fulling Watermill, Collingwod Watermill (Romaldkirk), Golden Grove Watermill (Ruswarp), Ryedale Open Air Museum Watermill, Rigg Watermill (Sneaton), Lendings Watermill (Startforth), Ullathorne's Watermill (Startforth), Surrender Watermill (Swaledale), Oldstead Watermill (Thirsk), Thirsk Watermill, Thornton Steward Watermill, Upsall Mill Farm Watermill, Whitby Watermill, Fowl Green Farm Watermill (Whitby), Wycliffe Watermill, Yarm Watermill.

A repurposed Lett's diary for 1935 measuring 7.5 cm x 11.5 cm, containing measurements, notes, calculations and drawings on a variety of engineering and milling matters including the windmills itemised at 'Place access points' below. Reference is made to the impact of gales at Winchelsea (which eventually blew down in gales in 1978 and 1987).