http://www.post-gazette.com/pg/06312/736519-178.stmw
snowballs at Dallas Cowboys
http://www.governor.state.pa.us/portal/server.pt?open=512&objID=3080&&level=1&css=L1&mode=2&in_hi_userid=2&cached=true
Photo courtesy of Carnegie Mellon University.
http://www.post-gazette.com/pg/06312/736519-178.stmw
snowballs at Dallas Cowboys
http://www.governor.state.pa.us/portal/server.pt?open=512&objID=3080&&level=1&css=L1&mode=2&in_hi_userid=2&cached=true
Photo courtesy of Carnegie Mellon University.