Dear GISIDEAS 2008 organizers, I am a PhD students of Ha Noi University of Science, Viet Nam. I am researching on water contamination of river mouths of Midle of Viet Nam (Thanh Hoa Province). I want to share my results in this Conference. After having your anouncement for expand date to registrate Abstact of my thesis. Thanks in advance,   PhD Hoang Van Tam Mobile: 0913599409 Add: Ha Noi University of Science, 324 Nguyen Trai, Thanh Xuan, Ha Noi