Hansen, H.N. 1929: Etiology of the pink-root disease of onions. Phytopathology 19(8): 691-704.
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| Hansen, H.N. 1929: Etiology of the pink-root disease of onions. Phytopathology 19(8): 691-704. |
| Hansen, H.N. 1929: Etiology of the pink-root disease of onions. Phytopathology 19(8): 691-704. |