M.V.K. Sivakumar Agroclimatology of west africa : Niger agroclimatologie de l` Afrique de l` ouest : Le Niger - 2nd Edition - Andhra Pradesh International Crops Research Institue for the Semi-Arid Tropics 1993 - 108p ENGLISH ISBN: 92-9066-238-7 Dewey Class. No.: 630.2515 / ICRISAT