RIP, Don. I know the Confidential Frequency List wasn't his book, but since someone mentioned it, that book was also one that launched my interest in shortwave. After I got a scanner and a CB radio as a kid, I obsessively checked out every single book about radio that the local library had. Mostly ARRL stuff but, oddly, they had a copy of the Confidential Frequency List and I obsessed over it until I could cajole my parents into getting me a shortwave receiver. The abbreviated, terse descriptions of odd things heard on a frequency (example I still remember: "Tailpipe Perky") had me convinced I was going to be listening to spies and intrigue nonstop.