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  Author Title Year Publication Volume Pages Links
Ubierna, J.A.J. Tunnel heritage in Spain: Roots of the underground 1998 Tunnelling and Underground Space Technology 13 131-141 details   url
Rubin, R. Water conservation methods in Israel’s Negev desert in late antiquity 1988 Journal of Historical Geography 14 229-244 details   url
Heaton, T.H.E. Sources of the nitrate in phreatic groundwater in the western Kalahari 1984 Journal of Hydrology 67 249-259 details   url
Vogel, J.C.; Talma, A.S.; Heaton, T.H.E. Gaseous nitrogen as evidence for denitrification in groundwater 1981 Journal of Hydrology 50 191-200 details   url
Wilson, G.B.; McNeill, G.W. Noble gas recharge temperatures and the excess air component 1997 Applied Geochemistry 12 747-762 details   url
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