1948. Climatic changes and pre-white man. In The Great Basin with emphasis on glacial and postglacial times. Bull. Univ. Utah, 38(20), Biol. Ser., 10(7):168-191, 1 fig., 1 table, June 30.
Atkinson, D. A.
1901. The reptiles of Allegheny County, Pennsylvania. Ann. Carnegie Mus., 1901-1902, 1(4):145-157.
Babcock, H. L.
1919. The turtles of New England. Mem. Boston Soc. Nat. Hist., 8(3): 325-431, 16 pls., April.
1938. Field guide to New England turtles. New England Mus. Nat. Hist., Nat. Hist. Guides, 2:1-56, 9 pls., November.
Barbour, T., and Loveridge, A.
1929. Typical reptiles and amphibians. Bull. Mus. Comp. Zool., 69(10): 205-360, June.
Bartram, W.
1791. Travels through North and South Carolina, Georgia, east and west Florida, the Cherokee country, the extensive territories of the Muscogulges, or Creek Confederacy, and the country of the Chactaws; containing an account of the soil and natural productions of those regions, together with observations on the manners of the Indians. First Edition, Philadelphia, xxxiv+522 pp., 8 pls. (including frontispiece), 1 map. Plates unnumbered except "Plate IV" (dorsal view of head of softshell), inserted between pages 282 and 283.