Perennial Polyculture, Permaculture and Preservation: The Principle of Diversity. Jungck, J R The American Biology Teacher, 47:72–75, 1985. 2
bibtex   
@article{jungck_perennial_1985,
	title = {Perennial {Polyculture}, {Permaculture} and {Preservation}: {The} {Principle} of {Diversity}},
	volume = {47},
	shorttitle = {Perennial {Polyculture}, {Permaculture} and {Preservation}: {The} {Principle} of {Diversity}},
	journal = {The American Biology Teacher},
	author = {Jungck, J R},
	year = {1985},
	note = {2},
	pages = {72--75},
}

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