Bitter-pit of the apple Pole Evans, I. B. (Illtyd Buller), 1879-1968 creator text book Pretoria The Govt. Print. and Stationery Off 1909 1909
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ENG Apples Bitter pit Diseases and pests Transvaal (Colony). Dept. of Agriculture. Technical bulletin, no. 1 https://www.biodiversitylibrary.org/bibliography/56144 63606233 10.5962/bhl.title.56144 NIC