The Rider's Perpetual contains 23 volumes of schematics.
For your information:
Other big collections of schematics for the USA are the books «Most-Often-Needed Radio Diagrams», compiled by M.N.BEITMAN (beginning: 1926-1938 = Vol. 1).
The Copyright notice in Rider's volume 14 is 1944. But in the USA production of civil radios was stopped End 1942. Therefore the latest models contained are those of 1942. They also can be of much earlier date.