Palaeo-hydrogeological control on groundwater As levels in Red River delta, Vietnam

Søren Jessen^*, Flemming Larsen, Dieke Postma, Pham Hung Viet, Nguyen Thi Ha, Pham Quy Nhan, Dang Duc Nhan, Mai Thanh Duc, Nguyen Thi Minh Hue, Trieu Duc Huy, Tran Thi Luu, Dang Hoang Ha, Rasmus Jakobsen