00294nam a2200109Ia 450000500170000000800410001708200160005810000170007424500380009126000470012930000080017620260224041018.0260224s9999||||xx |||||||||||||| ||und||  a372.357 SIN  aSingh, Y.K.  0aTeaching of environmental science  aNew Delhi: A. P. H. Publishers Housec2005  a366