Many / most are teacher editions, and of course they're all free to a good home.
I'm in Clarendon at 1615 N. Cleveland St. Call first so I don't miss you or in case they're already snagged (I have many more in my VT Falls Church office too, and the VT semester there begins on Monday.
I also have a few science posters - sharks, mushrooms, other fish.
Jim 703-599-3643