Soft covered book titled GROUND THREAD HANDBOOK Taps, Chasers, Thread Gages, Rolling Dies. 6th Edition July 1, 1939, 193 pages, Catalog No. 14, JOHN BATHE & COMPANY.
This very detailed book explains
It is in VG+ condition, with the clean and intact and the binding is tight. A previous owner's name is written on the cover page.