A great book that covers the subjects is a first person narrative:

Here, There, and Everywhere - My Life Recording the Music of THE BEATLES

By: Geoff Riddick and Howard Massey
Forward by: Elvis Costello
Publisher: Gotham Books - March 2006

At age 15 Geoff lands a dream job at EMI - Abbey Road Studios.

Sincerely,
Gargoyle

The innovation in the early years, i.e. suspending a speaker and spinning it during recording. Unlike so many Beatles books ... this is not "a snow job.'