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2. Helton, A. W., 1954. Die-back and decline in Idaho orchards. Trans. Idaho State hort. Soc. 1954: 28–33.
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4. Helton, A. W. &D. E. Konicek, 1961. Effects of selectedCytospora isolates from stone fruits on certain stone fruit varieties. Phytopathology51 152–157.
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