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Rare Book Division, The New York Public Library. "49. The Shad Frog (Rana halecina). 50. The Wood Frog, young, (Rana sylvatica). 51. Pickering's Hylodes (Hylodes pickeringi). 52. The American Toad, adult, (Bufo americanus)." The New York Public Library Digital Collections. 1842 - 1844. https://digitalcollections.nypl.org/items/510d47d9-7703-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "49. The Shad Frog (Rana halecina). 50. The Wood Frog, young, (Rana sylvatica). 51. Pickering's Hylodes (Hylodes pickeringi). 52. The American Toad, adult, (Bufo americanus)." New York Public Library Digital Collections. Accessed April 24, 2024. https://digitalcollections.nypl.org/items/510d47d9-7703-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1842 - 1844). 49. The Shad Frog (Rana halecina). 50. The Wood Frog, young, (Rana sylvatica). 51. Pickering's Hylodes (Hylodes pickeringi). 52. The American Toad, adult, (Bufo americanus). Retrieved from https://digitalcollections.nypl.org/items/510d47d9-7703-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-7703-a3d9-e040-e00a18064a99 | title=
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49. The Shad Frog (Rana halecina). 50. The Wood Frog, young, (Rana sylvatica). 51. Pickering's Hylodes (Hylodes pickeringi). 52. The American Toad, adult, (Bufo americanus)., (1842 - 1844)
|author=Digital Collections, The New York Public Library |accessdate=April 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>