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1 free book by A. G. H. Thatcher, free to read online. Chapter 1 of any book is free, no account needed.
Scaffolding: A Treatise on the Design & Erection of Scaffolds, Gantries, and Stagings, with an Account of the Appliances Used in Connection Therewith for the Use of Contractors, Builders, Clerks of Works, Etc., with a Chapter on the Legal Aspect of the Question
A. G. H. Thatcher