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The Sheet Metal Worker’s Instructor: For Zinc, Sheet Iron, Copper, and Tin Plate Workers, and Others, Containing a Selection of Geometrical Problems, Also Practical and Simple Rules for Describing The Various Patterns Required in The Different Branches of The Above Trades (6th edition; Philadelphia: H. C. Baird and Co., 1906), by Reuben Henry Warn (multiple formats at archive.org)
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