This revised edition of Mr. Hilton's treatise on document examination work is a valuable and welcome publication. Mr. Hilton has expanded on his original book in a number of areas of importance in the questioned document field. Specifically, chapters on the identification of signatures and forgery detection and the identification of hand-lettering and numerals have been enlarged. Information on typewriter identification has been enlarged to include data on proportionally spaced and single element machines as well as modern electronic typewriter devices.