Marvelous map of Mexico and the Southwest, published shortly after Mexico's Independence from Spain.
Excellent pre-Smith cartography in Upper or New California, including the 3 rivers feeding the two Great Salt Lakes in Utah. Nice post Humboldt-Pike-Long cartography through the Rocky Mountains and the Plains. Excellent detail in Texas, which is named, without sign of the Austin, who was just then establishing first contacts with the region after obtaining a grant from Mexico in January 1823. Wheat notes that the reference on the Rio Sacramento's navigability to 50 liguas is one of the earliest observations on the Sacremento River.