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  1. Notes on the presence of nitrates in orchard soils / by J. H. Gourley and V.D. Shunk.
    By: Gourley, J. H. - Shunk, I. V. D.
    Publication info: Durham, N.H. :New Hampshire College of Agriculture and the Mechanic Arts,1916.
    Contributed by: NCSU Libraries (archive.org)
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