Morrison, L.G. 1977: Rapid spread of poplar leaf rot. Commercial Horticulture 9(3): 28-31.
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| Morrison, L.G. 1977: Rapid spread of poplar leaf rot. Commercial Horticulture 9(3): 28-31. |
| Morrison, L.G. 1977: Rapid spread of poplar leaf rot. Commercial Horticulture 9(3): 28-31. |