there is a radio show called "Wheels" with Ed Wallace on 570 AM in Dallas. every saturday morning the show has a 15 minute segment called "The Backside of American History" where Ed talks about little known facts of our country. Listening to it this weekend I heard him give out a couple EBooks that are compilations of this shows segments. Here is a link to the PDFs of these public domain books.
you can listen to sample segments of this show here to see if this is something your interested in reading.
(best viewed in IE)
if you like it you can catch new segments streaming on the net saturday mornings at http://www.klif.com/
i thought there were a few people here who might enjoy these previously untaught segments of history