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Walker, Earnest Artman Digital Repository at the University of Maryland University of Maryland (College Park, Md) 2016-04-21T16:45:06Z 2016-04-21T16:45:06Z 1939 https://doi.org/10.13016/M27J3G http://hdl.handle.net/1903/17525 English Plant pathology The development of storage scab of apple Dissertation open.access