A survey of Lake Champlain including Crown Point and St. Iohn's on which is fixed the line of forty five degrees north lattit. terminating the ...

Scale ca. 1:127,000. Manuscript, pen-and-ink and watercolor. Relief shown pictorially and by shading. Sectioned and mounted on cloth backing. In pencil, lower left margin: No. 10. Includes descriptive notes and "References to ...