00313nam a2200109Ia 450000500170000000800410001705000200005810000170007824500430009526000530013865000120019120251229124902.0251229s9999    xx            000 0 und d  aQH 541 .K8 1986  aKumar, H. D. 0aModern concepts of ecologycH. D Kumar  aNew Delhib Vikas Publlishing House Pvt Ltd 1986  aEcology