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040 a| GPOb| enge| rdae| pnc| GPOd| MvI;

042 a| pcc;

043 a| n-us---;

049 a| ERE#;

074 a| 0624-B-02 (online);

086 0 a| I 19.42/4-4:2012-5220;

100 1 a| McMahon, Peter B.,e| author.=| ^A430861;

245 10 a| Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010 /c| by P.B. McMahon.;

264 1 a| Reston, Virginia :b| U.S. Department of the Interior, U.S. Geological Survey,c| 2012.;

300 a| 1 online resource ([51] pages) :b| color illustrations, color maps.;

336 a| textb| txt2| rdacontent;

337 a| computerb| c2| rdamedia;

338 a| online resourceb| cr2| rdacarrier;

490 1 a| Scientific investigations report ;v| 2012-5220;

500 a| Title from title screen (viewed on July 2, 2015).;

500 a| GPO Cataloging Record Distribution Program (CRDP).;

504 a| Includes bibliographical references (pages 33-35).;

650 0 a| Groundwaterx| Analysis.=| ^A356768;

650 0 a| Aquifersz| United Statesx| Analysis.=| ^A328315;

650 0 a| Groundwaterx| Pollution.=| ^A328314;

650 0 a| Nitrates.=| ^A44936;

710 2 a| Geological Survey (U.S.)e| issuing body.=| ^A964818;

830 0 a| Scientific investigations report ;v| 2012-5220.=| ^A580890;

856 40 u| https://purl.fdlp.gov/GPO/gpo58813;

949 a| Click on web addressw| asish| joyner94;

596 a| 1;

998 a| 3799130;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 3799130-1001l| JNETm| JOYNERr| Ys| Yt| JNE1DOu| 8/13/2015x| EDOCUMENTz| JERESOURCE;

Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010 / by P.B. McMahon.

Author/creator	McMahon, Peter B. author.
Other author	Geological Survey (U.S.) issuing body.
Format	Electronic
Publication	Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2012.
Description	1 online resource ([51] pages) : color illustrations, color maps.
Supplemental Content	https://purl.fdlp.gov/GPO/gpo58813
Subjects	Groundwater--Analysis. Aquifers--United States. --Analysis. Groundwater--Pollution. Nitrates.

Series	Scientific investigations report ; 2012-5220 Scientific investigations report ; 2012-5220. ^A580890
General note	Title from title screen (viewed on July 2, 2015).
General note	GPO Cataloging Record Distribution Program (CRDP).
Bibliography note	Includes bibliographical references (pages 33-35).
GPO item number	0624-B-02 (online)
Govt. docs number	I 19.42/4-4:2012-5220

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Use of classes based on redox and groundwater age to characterize the susceptibility of principal aquifers to changes in nitrate concentrations, 1991 to 2010 / by P.B. McMahon.

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