00325nam a2200133Ia 4500008004100000020001800041082001200059082001000071100001800081245004200099260001000141260003100151260000900182230118s9999||||xx |||||||||||||| ||und||  a81-87125-20-9  a540.157  bTRI/F  as.nbtripathy 0afundamentals of environmental studies  adelhi  bvrinda publications (p)ltd  c1999