00503    a2200181   4500260001400000100001600014260001700030300001400047245013700061650001800198650001800216650001600234300002600250260000900276130000700285651001000292020001900302  aRotterdam  aGROVE, A.T.  bA.A. Balkema  axi-331 p.  aThe Niger and its neighbours : environmental history and hydrobiology, human use and health hazards of the major West African rivers  aEnvironnement  aHydrobiologie  aCours d'eau  bill.; 24 cm. - Index.  c1985  lEn  aNiger  a90-61-91-512-0