00389nam a22001577a 4500020001500000022001900015082001300034100001500047245005200062260003400114300000800148650002700156650001200183650001800195650001800213  a8120338944  a978-8120338944  a628.1RAN  aRana S V S  aEssentials of Ecology and Environmental Science  aNew DelhibPHI Learningc2013  a590  aEnvironmental sciences  aEcology  aHuman ecology  aHuman ecology