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“Univalve.” Plate 9, page 7. Collections of and digitalized by the Smithsonian Libraries. In the public domain due to age. via https://archive.org/details/elementsofconcho01brow/page/n7/mode/2up
“Parts of shells,Multivalve and bivalve.’ Plate 1, page 186. Collections of and digitalized by the Smithsonian Libraries. In the public domain due to age. via https://archive.org/details/elementsofconcho01brow/page/n186/mode/1up
“Parts of shells, bivalve and univalve. Plate 2, page 188. Collections of and digitalized by the Smithsonian Libraries. In the public domain. via https://archive.org/details/elementsofconcho01brow/page/n188/mode/1up
“Parts of shells, univalve.” Plate 3, page 191. Collections of and digitalized by the Smithsonian Libraries. Fair use licence. via https://archive.org/details/elementsofconcho01brow/page/n190/mode/1up
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