I own all (I think) of the TOS era Bantam novels and short story collections from way back (though some in their UK Corgi editions), and just about all of the early Pocket novels (the first 50 or so); as well as a fairly comprehensive selection of early non-fiction books, including some obscure ones like The Making of the Trek Conventions by Joan Winston, Letters to Star Trek by Susan Sackett and Star Trek Intragalactic Puzzles by James Razzi.