<style face="normal" font="default" size="100%">Nitrogen pollution: From the sources to the sea</style>

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<style face="normal" font="default" size="100%">Nitrogen pollution: From the sources to the sea</style>

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<style face="normal" font="default" size="100%">Nitrogen pollution in the northeastern United States: Sources, effects and management options</style>

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<style face="normal" font="default" size="100%">Nitrogen pollution: Sources and consequences in the U.S.Northeast</style>

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<style face="normal" font="default" size="100%">Vitality and chemistry of roots of red spruce in forest floors of stands with a gradient of soil Al/Ca ratios in the northeastern United States</style>