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by Magdoff, Fred
by Magdoff, Fred; Foster, John Bellamy
by Fred Magdoff, Harold van Es
by Gilman, Steve; Langer, Jocelyn; Magdoff, Fred
by Bellamy Foster, John y Fred Magdoff
by Gilman, Steve; Magdoff, Fred; Byczynski, Lynn; et al.
by Clark, Brett; Magdoff, Fred; Holderlin, Friedrich; et al.
by Magdoff, Fred; Van Es, Harold; Sustainable Agriculture Network