Library and Archives Canada: 16mm.
"Aerial surveying of Canada's land mass of mapmaking purposed by the R.C.A.F. Photographic Squadron. Exterior and interior views of hangars of 408 Photo Squadron, Cansos and Lancaster aircraft visible, being worked on by mechanics, etc. An air crew is briefed, Lancaster engines are started. Planes take off for base camps. Sequences on explanation of principles involved with some use of animation, with regard to the whole process, the use of Shoran, etc. Sequences on base camp operations, Canso flying boats landing, unloading supplies, etc. An R.C.A.F. DH Otter seaplane is also used. Several air to air shots of Lancaster in flight, of interior as crew carries out various tasks."