00446cam a22001337a 4500008004000000082001100040100001600051245006000067260005200127300001000179650002200189999001900211952008200230180718b1989   xxu||||| |||| 00| 0 eng d  aY Si64  aSingh, H.S.  aPrinciples of environmental conservationcby H.S. Singh  aDehradunbInternational Book Distributorsc1989  a273p.  aNatural resources  c353188d353188  00104070aIIPAbIIPAd1993-11-30oY Si64p64484r2018-07-21w2018-07-21yBK