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1Academic Journal
Authors: NIRULA, RAM L.
Source: Annals of Botany, 1928 Apr 01. 42(166), 431-467.
Access URL: https://www.jstor.org/stable/43237114
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2Academic Journal
Authors: PAINE, SYDNEY G., NIRULA, RAM. L.
Source: Annals of Applied Biology; Feb1928, Vol. 15 Issue 1, p46-56, 11p