Tubes of Steel, being the history of Howell & Co Ltd, Sheffield Tube Works, 1865-1971 / C. W. Spalding, [1971 Oct. Typescript, 105pp (including illustrations), in ring binder. A history of Howell & Co., written after its ceasing to be an operating company in 1971. Howell & Co. became part of Tube Investments in the 1930s. Spalding worked for the company from 1917-1969]