Read before the fifth meeting of the American association for the advancement of science, held at Cincinnati, May, 1851.
Microform. Chicago, Library Resources, 1972. 1 microfiche ; 8 x 13 cm. Reduction ratio varies. (Library of American civilization) Title on heading: Continental expansion: Tex., Br. N.Am., etc. and Microform. Ann Arbor, Mich., University Microforms, 1956? 1 microfilm reel ; 35 mm. (American culture series)