00417nam a2200121 a 450000500170000008200150001710000180003224500760005026000480012630000280017449000430020250000500024520251203090710.0  a577.4bGRA  aCoupland, R.T  aGrassland ecosystems of the world: analysis of grassland and their uses  aCambridgebCambridge University Pressc1979  axxviii,401p.c23cm.bHB  aInternational biological programmea18  aincludes bibliographical references and index