Seefeldt, D., Hantman, J. L., & Onuf, P. S. (2005). Across the continent: Jefferson, Lewis and Clark, and the making of America. Charlottesville: University of Virginia Press.

Seefeldt, Douglas, Jeffrey L. Hantman, and Peter S. Onuf. Across the Continent: Jefferson, Lewis and Clark, and the Making of America. Charlottesville: University of Virginia Press, 2005.

Seefeldt, Douglas, Jeffrey L. Hantman, and Peter S. Onuf. Across the Continent: Jefferson, Lewis and Clark, and the Making of America. Charlottesville: University of Virginia Press, 2005.