US STOCKS-Wall St slips on euro-zone worries; retailers drag By: Reuters: Company News May 20, 2011 at 15:10 PM EDT * Dow down 0.6 pct, S&P off 0.6 pct, Nasdaq off 0.5 pct Read More >> Related Stocks: 3M Co Barnes & Noble Caterpillar Gap Standard & Poors 500