The original web site was put up by one of the authors but disappeared along with the hosting company.   But I found a copy of it here:

http://vho.org/aaargh/fran/livres8/Hydra.pdf

Yeadon was interviewed here: https://www.youtube.com/watch?v=GtnL3x2NGzM

The book is available on amazon here:

http://www.amazon.com/The-Nazi-Hydra-America-Suppressed/dp/0930852435/ref=sr_1_1?ie=UTF8&qid=1389657651&sr=8-1&keywords=nazi+hydra+in+america