There are two folded maps in the journal:
“Map of the Oregon Territory by U.S. Ex. Ex. and the Columbia River, reduced from a survey made by the U.S. Ex. Ex. 1841. J. H. Young & Sherman V. Smith, New York.” 91 ½ x 63 cm. (See Wilkes’ Atlas, Map [4].)
“Map of Upper California by U.S. Ex. Ex. and best authorities, 1841.” 31 x 27 cm. (See Wilkes, V, 151.)