Brazilian, Mexican stocks drop, erasing gains By: MarketWatch October 23, 2009 at 15:58 PM EDT Falling stocks in the materials and industrial sectors sharpen a pullback in Latin American equities. Read More >> Related Stocks: Cemex S.A.B. DE C.V. ADR Dow Jones Industrial Average (EOD) Gerdau S.A. ADR Petrobras - Petroleo Brasileiro S.A. Tenaris S.A. ADR Vale ADR Representing One Ord Shs