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Heron-Allen, E.; Earland, A. (1928). On the Pegididae, a new family of Foraminifera. Journal of the Royal Microscopical Society. 283-299.
Heron-Allen, E.; Earland, A. (1928). On the Pegididae, a new family of Foraminifera. Journal of the Royal Microscopical Society. 283-299.