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200 10$aEvaluation of conceptual models of natural organic matter (humus) from a consideration of the chemical and biochemical processes of humification$b[electronic resource] /$fby Robert L. Wershaw
210  1$aReston, Va. :$cU.S. Dept. of the Interior, U.S. Geological Survey ;$aDenver, CO :$cU.S. Geological Survey, Information Services [distributor],$d2004.
225 1 $aScientific investigations report ;$v2004-5121
300   $aTitle from title screen (viewed on Sept. 09, 2004).
320   $aIncludes bibliographical references.
517   $aEvaluation of conceptual models of natural organic matter 
606   $aHumification
606   $aHumus
606   $aBiodegradation
606   $aSoil chemistry
615  0$aHumification.
615  0$aHumus.
615  0$aBiodegradation.
615  0$aSoil chemistry.
700   $aWershaw$b R. L$01380672
712 02$aGeological Survey (U.S.)
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801  1$bGIS
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906   $aBOOK
912   $a9910692666103321
996   $aEvaluation of conceptual models of natural organic matter (humus) from a consideration of the chemical and biochemical processes of humification$93422614
997   $aUNINA