Large B/W folding chart showing the progress of the Surveys and Resurveys Between the St. Croix and Hudson Rivers. The map shows the main lines of triangulation made during the year ending in June 30th, 1893 from Canada in the north and New York in the south, reaching eastward to the coast of Maine.
Surveys and Resurveys Between the St. Croix and Hudson Rivers, 1893
Chart 9. Progress of the Surveys and Resurveys Between the St. Croix and Hudson Rivers, June 30, 1893.