(Dundee, OR)  --  An appeal is being made to the public for help in finding a missing Yamhill County woman.  Thirty-eight-year-old Jennifer Huston of Dundee, who's a mother of two young children, hasn't been seen or heard from since Thursday.  Police say Huston was last seen at a Circle K convenience store in Newberg, around six p.m. Thursday, driving a dark-green, 1999 Lexus LX with Oregon license plate WXH 011.  A "Find Jennifer Huston" Facebook page has been established, and a reward is being offered for information leading to her safe return.