The Book of the Royal Enfield
by R. E. Ryder
Published by Pitman's Motor Cyclists Library, 1943
Hardcover, 132pp, illustrated
The cover is a worn and smudged, and the pages are a bit delicate, but over all the book is in decent shape and still quite readable.
"A Complete Guide For Owners And Prospective Purchasers Of Royal Enfield Motor-Cycles From 1934 Onwards"
"Dealing With Every Phase Of The Subject, Including Chapters On Driving, Legal Matters, First Principles, Lubrication, Electric Lighting And Overhauling"