"The Feldman Method" gives some good insights on prospecting and selling, although its focus is on insurance sales its guidelines apply on most any field, it is concise and doesn’t go into as much technical detail as more modern books on the subject while still conveying the basics on what is needed to be a successful salesman.
However, the book reads at least partially as corporate indoctrination to its Salesforce, for example: it emphasizes time and again a 12 hour / 7 days a week work schedule, plus a couple more hours of study every day to stay on top of his game as two of the keys to Feldman’s success.