LEADER 00942nam  2200169z- 450 
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101 0 $aeng
200 10$aMethods of analysis by the U.S. Geological Survey National Water Quality Laboratory : evaluation of alkaline persulfate digestion as an alternative to Kjeldahl digestion for determination of total and dissolved nitrogen and phosphorus in water
210   $aDenver, Colo
517   $aMethods of analysis by the U.S. Geological Survey National Water Quality Laboratory 
906   $aBOOK
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996   $aMethods of analysis by the U.S. Geological Survey National Water Quality Laboratory : evaluation of alkaline persulfate digestion as an alternative to Kjeldahl digestion for determination of total and dissolved nitrogen and phosphorus in water$93177900
997   $aUNINA