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Cushman, J.A.; Todd, R. 1949. The genus Sphaeroidina and its species. Contr. Cushman Lab. Foram. Res. 25: 11-21.
Cushman, J.A.; Todd, R. 1949. The genus Sphaeroidina and its species. Contr. Cushman Lab. Foram. Res. 25: 11-21.