Willey, Clarke R.2015-11-132015-11-131922http://hdl.handle.net/10919/64070[22] leavesapplication/pdfen-USCreative Commons Public Domain Mark 1.0LD5655.V855 1922.W555Crown-gall diseaseApples -- Diseases and pestsAn experiment on controlling the crown gall of the apple treeThesis