Downie et al., 1961
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Downie, C., Williams, G.L. and Sarjeant, W.A.S., 1961: Classification of fossil microplankton. Nature, v.192, no.4801, p.471.
Downie, C., Williams, G.L. and Sarjeant, W.A.S., 1961: Classification of fossil microplankton. Nature, v.192, no.4801, p.471.