The Nuclear War Atlas book is out of print, but I found copies listed on Amazon (affiliate link) and AbeBooks
I also found this blog post about the book. Includes a handful of page scans.
I make Ludiphilia entirely on my own — I even compose the music now. It's a labour of love, and I have no plans of quitting as long as I can afford to pay the hosting and domain fees, but I would very much like to spend more time on it than I currently do. That requires money, unfortunately.
So if you'd like to support the show, you can make a donation via Patreon or PayPal. (Or email me at richard at ludiphilia dot net if you have some other thing you like to use for donations.) For PayPal, use the payment form on paypal.me/mossrc. For Patreon, head to patreon.com/ludiphilia.
You can also support the show by leaving a rating and review on iTunes and sharing it with other people. And by buying my first book, The Secret History of Mac Gaming, the profits from which are helping me make my podcasts better (through equipment upgrades, reduced freelance income pressures, and the like).