I posted what might be a source you need two years ago here.
But the website it's talking about is down right now.
Harte

3,500 Occult Manuscripts Will Be Digitized & Made Freely Available Online, Thanks to Da Vinci Code Author Dan Brown
If there’s one thing The Da Vinci Code’s Dan Brown and “The Library of Babel”’s Jorge Luis Borges have in common it is a love for obscure religious and occult books and artifacts.