The Heinlein Archives, now digitally available

Robert A. Heinlein is best known as one of the 'Big 3' of science fiction writers (along with Isaac Asimov, and Arthur C. Clarke). More about his life can be found here.

His bibliography can be found here.

Located at http://www.heinleinarchives.net/upload/, this collection:

...presents digital copies of the entire collections of Robert A. and Virginia Heinlein in downloadable form for research and academic purposes. Heinlein’s OPUS manuscripts is the first complete collection presented. These manuscript files include Heinlein’s files of all his published works with his notes, research, early drafts and edits of manuscripts, to the final published form. These files provide both a look at Heinlein’s creative process and add insights into his intent and the meaning in his stories.

It's like having access to the director's cut, to better grok the man and his stories. For a fee, of course. TANSTAAFL.