From John Fisher's auction, lot 42.
David Roth published an important memory course in the thirties, forerunner of many modern books. This is one volume of the British edition of the course. I have all 7 volumes in this lot.
This copy is in very poor condition: the cover is detached and the covers' edges are teared. Some slight foxing on the pages.
The course is currently available online (lybrary.com).