Olsson A.A. (1932). Contribution to the Tertiary paleontology of northern Peru: Part 5, the Peruvian Miocene. <em>Bulletins of American Paleontology.</em> 19(68): 1-272, 24 pls., available online athttps://www.biodiversitylibrary.org/page/32532232[details]
MolluscaBase eds. (2024). MolluscaBase. Bursa (Marsupina) freya Olsson, 1932 †. Accessed at: https://molluscabase.org/aphia.php?p=taxdetails&id=1616453 on 2024-04-29
original descriptionOlsson A.A. (1932). Contribution to the Tertiary paleontology of northern Peru: Part 5, the Peruvian Miocene. <em>Bulletins of American Paleontology.</em> 19(68): 1-272, 24 pls., available online athttps://www.biodiversitylibrary.org/page/32532232[details]
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