"Hydrology." . . "Aquifères." . . "Aguas subterráneas." . . "Hydrogéologie." . . "Groundwater." . . "International Hydrological Programme." . . "Hydrology Research." . . . . . "Ground-water studies : An international guide research and practice : A contribution to the international Hydrolical Decade" . "Ground-Water studies" . . . . "Ground-water studies : an international guide for research and practice : a contribution to the International Hydrological Decade" . . . "Ground-water studies : an international guide for research and practice" . "Ground-water studies : an international guide for research and practice"@en . . . . . . "Groundwater studies : An international guide for research and practice" . "Ground-water Studies" . . "Ground-water studies; an international guide for research and practice"@en . . . . . . . . . "Ground-water studies an international guide for research and practice"@en . . . "Ground-water studies : an international guide for research and practice ; a contribution to the International Hydrological Decade" . . . . . . . . . . "Ground-water studies : an international guide for research and practice, a contribution to the International hydrological decade" . . . . . . . . . . . . . . . . "Ground-water studies : an international guide dor research and practice" . . . . . . . . . "Unesco." . . . . "Eaux souterraines." . .