Growth responses of old-field plants to a nitrogen gradient. Cowan, M. M.S. Thesis, University of Minnesota., 1986.
bibtex   
@article{cowan_growth_1986,
	title = {Growth responses of old-field plants to a nitrogen gradient.},
	journal = {M.S. Thesis, University of Minnesota.},
	author = {Cowan, M.L.},
	year = {1986},
	keywords = {CDR}
}

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