Haller, M. H. (Mark Hughlin), 1897-; Cassil, C. C. (Carroll Clayton), 1911-; Gould, Edwin. & Schrader, Albert Lee, 1896-. Further studies on the removal of spray residues from eastern-grown apples.. Washington, D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc3503/. Accessed March 6, 2015.
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