Palaeozoic sponges of North America / [William R. Head] Head, William R. creator text book [Chicago 1895] 1895
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ENG North America Sponges, Fossil Museum of Comparative Zoology--Biodiversity Heritage Library digitization project https://www.biodiversitylibrary.org/bibliography/14954 28570304 10.5962/bhl.title.14954 HMZ