Department of the Interior Astronomical Branch. Map Showing Precise Levelling by the Geodetic Survey of Canada.(Scientific- orienteering- Canada). Issued 1918. C. A. French, Magnetician. Otto Klotz, LL. D.,D. SC. Uncommon large folding early 20th century color lithographed map. Overprinted in red to show what had been published or not. Well preserved, clean, nice looking example with pleasing age patina. Original fold lines as issued. Sheet Measures c. 22 3/8"H x 35 1/4"W. Engraved Area Measures c. 19 3/8"H x 34"W.[R19624].