This book, often simply called the "Red Book" due to it's RCA Red cover, is the penultimate guide to vacuum electronics. Consisting of 1,538 pages of everything from basic terminology and tables, to complex circuit design and analysis, this book is pretty much anything you need if you want to learn how vintage electronics works. All of the other information in this book holds true today, and it's still a great resource for looking up things like wire gauge and various formulae that you may not use on a daily basis.