This lot of five volumes of the AUDELS Engineers and Mechanics Guide from 1921 is a must-have for collectors and enthusiasts of antique books. The set includes volumes 1, 2, 3, 4, and 5, each bound in high-quality leather and illustrated with special attributes. The books were published by Theo Audel & Co. in the United States and are in their original form, not facsimiles. The set covers a range of topics including science, medicine, and engineering. The books are in English language and are not personalized or signed. They are a great addition to any collection of antiquarian books and will be a valuable resource for anyone interested in the history of engineering and mechanics.