00555nam a2200169   450000500170000000800410001702000180005804000510007608200180012710000190014524500750016426000520023930000330029165000290032465000120035370000200036520260723124813.0260723s        |||||||| |||| 00| 0 eng d  a9788121927642  cCentral Library - University of BarisaldCL-UB  a333.707 bAST  aAsthana, D. K.  aA textbook of environmental studies/bycD.K. Asthana and Meera Asthana  aNew Delhi : b S. Chand & Company Ltd., c2006.  a470 p. : b ill. ;  c24 cm.  aEnvironmental sciences    aEcology  aAsthana, Meera.