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3 records were found.

	Callen, E.O. (1954). The internal microflora of buds and twigs. Proceedings of the Canadian Phytopathological Society 21: 12.
	Callen, E.O. (1949). Notes on Circinella simplex van Tieghem. Transactions of the British Mycological Society 32 (3-4): 337-340, 1 fig., 1 graph.
	Callen, E.O. (1950). Notes on Circinella simplex van Tieghem. Transactions of the British Mycological Society 32 (3-4): 337-340, 2 figs.