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© The New York Public Library, 2024
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General Research Division, The New York Public Library. "1. Pana halecina, Spotted Frog, b. under surface of head, c. under surface of left fore foot, d. under surface of left hind foot; 2. Rana boylii, Boyl's Frog (California), a. b. lateral and under views, c. d. as in preceding,; 3. Rana boylii, Boyl's Frog, young. b. c. as c. and d. in preceding; 4. Rana septentrionalis, Northern Frog (Fort Ripley, Minnesota). a. b. etc., as in preceding; 5. Rana catesbiana, Catesby's Frog. References as in Fig. 2." The New York Public Library Digital Collections. 1860. https://qa-digitalcollections.nypl.org/items/510d47d9-5756-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "1. Pana halecina, Spotted Frog, b. under surface of head, c. under surface of left fore foot, d. under surface of left hind foot; 2. Rana boylii, Boyl's Frog (California), a. b. lateral and under views, c. d. as in preceding,; 3. Rana boylii, Boyl's Frog, young. b. c. as c. and d. in preceding; 4. Rana septentrionalis, Northern Frog (Fort Ripley, Minnesota). a. b. etc., as in preceding; 5. Rana catesbiana, Catesby's Frog. References as in Fig. 2." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47d9-5756-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1860). 1. Pana halecina, Spotted Frog, b. under surface of head, c. under surface of left fore foot, d. under surface of left hind foot; 2. Rana boylii, Boyl's Frog (California), a. b. lateral and under views, c. d. as in preceding,; 3. Rana boylii, Boyl's Frog, young. b. c. as c. and d. in preceding; 4. Rana septentrionalis, Northern Frog (Fort Ripley, Minnesota). a. b. etc., as in preceding; 5. Rana catesbiana, Catesby's Frog. References as in Fig. 2. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47d9-5756-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47d9-5756-a3d9-e040-e00a18064a99 | title=
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1. Pana halecina, Spotted Frog, b. under surface of head, c. under surface of left fore foot, d. under surface of left hind foot; 2. Rana boylii, Boyl's Frog (California), a. b. lateral and under views, c. d. as in preceding,; 3. Rana boylii, Boyl's Frog, young. b. c. as c. and d. in preceding; 4. Rana septentrionalis, Northern Frog (Fort Ripley, Minnesota). a. b. etc., as in preceding; 5. Rana catesbiana, Catesby's Frog. References as in Fig. 2., (1860)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>