In the late 30's and during WWII the SS took over many Masonic Lodges for their selfish purposes. I'm not surprised that Himmler was interested in the material. Many Freimauer went to concentration camps because they refused to lie down to the Nazis.
That would make a cool battle by which Allied special forces were to try to infiltrate the SS library and try to take several key books that would be very useful to the III Reich.
I bet the library would be protected by elite Waffen SS, Magik and Totenkopf robots.