Hebert, C E Stable nitrogen isotopes in waterfowl feathers reflect agricultural land use in western Canada. [electronic resource] - Environmental science & technology Sep 2001 - 3482-7 p. digital Publication Type: Journal Article ISSN: 0013-936X Standard No.: 10.1021/es001970p doi Subjects--Topical Terms: AgricultureAnimalsCanadaDucksEnvironmental MonitoringEnvironmental PollutantsFeathers--chemistryNitrogen Isotopes--analysis