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Pyrgo williamsoni (Silvestri, 1923)
Description Loeblich, A.R.; Tappan, H. (1953). Studies of Arctic foraminifera. Smithsonian miscellaneous collections. vol. 121., available online at http://www.biodiversitylibrary.org/page/27011060#page/363/page(s): p. 48 pl. 6 fig. 1-4 ·
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