The generic outer cover of this manual is pictured below.
Believe it or not, it took 11 years for H-D to come out with the "permanent" manual promised in the 1948 Temporary Service Manual.
"This maintenance and repair manual applies directly to the 1959 Harley-Davidson and Hummer motorcycles. Except for minor differences, it also applies to the 1953-1958 Model 165 and the 1955-1958 Hummer.
In general, this manual will also be useful in maintaining and repairing the 1948-1952 Model 125."
This generic cover was probably used on other manuals.