Third Edition of the Mechanical Engineers' Handbook, edited by Lionel S. Marks and published by the McGraw-Hill Book Company in 1930.
This book served as a standard reference work for mechanical engineers, covering formulas, data and practices. Commonly referred to as "Marks' Handbook", it went through multiple editions over several decades.
The leather bound book is complete with no pages missing. The leather shows signs of wear which is consistent with its age.