There is a huge library of book on mobipocket
http://www.mobipocket.com/freebooks/default.aspx , including a lot of Burroughs.
Unfortunately, they are in .mobi format and you have to download the free e-reader. The e-reader is good on PC, Blackberry, and a few other devices. They used to have software that would publish text files to mobi reader files.
P.S. It's been awhile, so I went to Mobi to install the reader on my new PC. It appears that Mobipocket was taken over by Amazon. I read the license agreement before installing and it is the most frightening one I have ever read. I didn't install the software.
P.S.S. I installed FBReader
http://www.fbreader.org/
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