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Economics of the Farm Manufacture of Maple Syrup and Sugar

Alexander GershoyAnna Shepard LutmanHoward Bowman EllenbergerJohn Allen HitchcockLewell Seth WalkerMarshall Baxter CummingsWilliam Ritchie AdamsEllsworth W. BellErwin Wheat JenkinsVermont Agricultural Experiment Station

出版	Vermont Agricultural Experiment Station, 1928
URL	http://books.google.com.hk/books?id=ospQAQAAMAAJ&hl=&source=gbs_api