00460nam a2200169 a 450000500170000008200170001710000180003410000150005210000170006724500590008426000310014330000230017449000290019763000120022663000260023863000260026420251203091414.0  a577.028bTRI  aTrivedy, R.K.  aGoel, P.K.  aTrisal, C.L.  aPractical methods in ecology and environmental science  aKaradbEnvironmentalc1987  a340 p.b22 cm.cHB  aSeries in methodologyd2  aEcology  aEnvironmental science  aPractical methodology