In thee area of historical context I would recommend "Putting he Record Straght" the autobiography of John Culshaw. For the younger generation, JC joined Decca Records in 1946 and served as it's foremost producers of classical music through 1967, when he left Decca and ended up at the BBC. He was instrumental in assembling Deccas recording team for classical music as well as producing many of the greatest Decca recordings of that era. His autobiography is not a technical account but does provide a fascinating look at the growth and development of the record industry from its infancy to becoming a multimillion dollar industry. Topics include the birth of stereo recordings, personal recollections of artists of the time (HVK, Solti, Pavarotti, Neilson. Ansermet, Kubelik and others), and the economics and politics of producing recordings. This book may be difficult to find but is definitely worth finding/reading if classical recordings are of interest to you.