Data sheets shows 2 colored cross sections. "1966-1968." "Synthèse hydrologique du Bassin du Lac Tchad (Reg 71) = Study of water resources in the Lake Chad Basin (Reg 71)." "UNDP (Special Fund) UNESCO." "Printed by Institut Géographique National, Paris - 1969." French and English.
Creator:
United Nations Development Programme, Special Fund Component.
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