The Secret Teachings

are available online:

THE SECRET TEACHINGS OF ALL AGES
by Manly P. Hall

However, if you've not yet experienced the original larger-than-life format, held it in your hands to feel its sheer girth weighing down on your lap as you're paging through it, you really ought to do that at least once in your lifetime. Oh, and the online text is also missing copies of the color plates that are in the original, but otherwise, it's really excellent to see this available online.

Thanks for the pointer, Jon!