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[Scatty]

Just few things to add to kmonster's post.
1. Items you drop CAN get lost (disappear) after a while, no matter if normal or critical quest items. Doesn't matter where you drop them, there is no safe location in the game, not even the abbey with Father Ruale in New City. I tested myself. So be careful what you drop - if you'll need it later, chances are it's gone.
2. Don't drop the ?LEGEND? map. Don't sell it, don't get rid of it, it is critical for a quest later on Hall of the Dead on the Crypt Isle. If you drop it, you're risking for it to disappear after a while, and then you're stuck if you don't use a savegame editor. Any other maps can be sold, they aren't important.