Most of the I collected meandering the internet;
this is where the picture came from;
Prototypes.com they have a nice collection, not only Ekranoplans
I have this book, nice with lots of photo's and 3way drawings;
Amazon.com: Russia's Ekranoplans-The Caspian Sea Monster and other WIGE Craft-Red Star Volume 8 (9781857801460): Sergey Kommissarov: Books