Topographic map of the Rockies, 1890

This map is part of a group of 21 sheets produced between 1888 and 1892. The government used phototopography to survey hard-to-reach areas. Developed in Europe, phototopography made it possible to quickly map high-elevation regions and large expanses of wilderness.

Catalogue entry:
Canada. Topographical Surveys Branch.
Castle Mountain sheet / triangulation by W.S. Drewry, D.L.S. ; topography by J.J. McArthur, D.L.S. — Scale 1:40 000. — [Ottawa] : Topographical Surveys Branch, [1889?-1892?] (Ottawa : Mortimer & Co. Lith.). — 1 map : col. ; 35 x 30 cm, on sheet 57 x 44 cm. — (Topographical survey of the Rocky Mountains). —

Ref. No.: NMC 009877