A map of America between latitudes 40 and 70 north, and longitudes 45 and 180 west : exhibiting the principal trading stations of the North West Company.178-?]Part of imprint is faintly visible in bottom margin: [?]acKen[?] No. 38 No[?]folk Street Strand.Relief shown by hachures.Rivers and lakes in the Pacific Northwest and British Columbia are in manuscript, pen-and-ink.cartographic