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| Author | Title | Year  |
Publication | Volume | Pages |
|---|---|---|---|---|---|
| Ubierna, J.A.J. | Tunnel heritage in Spain: Roots of the underground | 1998 | Tunnelling and Underground Space Technology | 13 | 131-141 |
| United Nations | Stampriet Transboundary Aquifer System Assessment: governance of Groundwater resources in Transboundary Aquifers (GGRETA), phase 1: technical report | 1998 |