It comes with spell book, map, manual and cluebook and automatically runs DOSBox when you play the game so all you have to do is click the icon and the game will play! Now there is officially no reason or excuse for any RPG fan to not try out Ultima IV, one of the most defining/influental/revolutionary games of the genre (more so than FF7 or Chrono Trigger!)
GOG in general is a great place for buying retro RPG games.