Phelps's National map of the United States.

"Entered according to act of Congress in the year 1849 by Ensign & Thayer ... southern district of New York."
Prime meridian: Washington D.C.
Includes insets "Map of Oregon, California & Texas", "Southern part of Florida", "N. part of Maine", and portraits of U.S. presidents and statesmen and state emblems.
Available also through the Library of Congress Web site as a raster image.