Date: 6/1/2000 Category: Business Page: D1 Byline: THEO FRANCIS ARKANSAS DEMOCRAT-GAZETTE Text: Drivers for one of the nation's largest mail-hauling contractors approved unionizing by a 3-1 margin in a mail-in ballot counted Tuesday. The 246 drivers at Pat Salmon and Sons Inc.'s North Little Rock terminal voted 158-40 to be represented by the American Postal Workers Union, Central Arkansas Area Local 189.