00342nam a22001337a 4500003000400000005001700004008004100021020001800062040000800080100002400088245003100112250001600143260004900159OSt20180801110155.0180801b        xxu||||| |||| 00| 0 eng d  a0-02-427390-2  cn/a  aRobert H. Whittaker  aCommunities and Ecosystems  a2nd edition  aNew YorkbMacmillan Publishing Companyc1975