00343nam a2200121 a 450000500170000002000150001708200150003210000220004724500270006926000390009630000210013549000650015620251203110425.0 a812611102X a577.6bFRE aMishra, Ravi ed., aFreshwater environment aNew DelhibAnmol Publicationc2002 a226p.c22cm.bHB aEncyclopedia of geographical science and environment science