CHICAGO (Standard&Poor's CreditWire) Nov. 19, 1999--Standard&Poor's today assigned its double-'A'-minus rating Sioux City, Iowa's $10 million GO bonds series 1999 dated Dec. 1, 1999, due June 1, 2001-2012. In addition, Standard&Poor's affirmed its double-'A'-minus rating on the city's $62.37 million outstanding GO bonds, as well as its double-'A'-minus underlying rating (SPUR) on the $9.98 million GO bonds. The outlook is stable. The rating reflects: -- A regional economy with strong links to the agricultural sector, -- A sound financial position, and -- Moderate debt. Sioux City is a regional trade center for west-central Iowa and portions of South Dakota and Nebraska. The agricultural sector is centered predominantly in meat processing, with IBP Inc. (headquarters