This week the WTWF guys look at the various bootleg releases of the Beatles January 1969 "Get Back" sessions.    The earliest Beatles bootlegs came about from leaks of the Glyn Johns acetates that were reviewed in "Rolling Stone" a few months later.       Then throughout the seventies, the Nagra Reels tapes served as the source of some of the more interesting Underground releases.     Finally, through the CD and Internet age, the majority of the tapes (over 100 hours) were collated and made available to those who know where to look.