00278     2200121   4500001002100000005001500021035002000036245002900056100001300085260003000098082001100128084001700139INLIS00000000000463720240326030307  a0010-03240046371 aThe Ecology of Lake Toba0 aZulkifli  aMedan :bUSU Press,c2008  a577.63  a577.63 Zul T