Old Man River Dam in 1949-51 (left) and 2013 (right)
Alberta Historical Orthophotos
Historical Orthophotos of Alberta contains georeferenced orthophoto maps consisting of aerial photography mainly from 1949 to 1951 with coverage for the whole province. It also contains various maps created with photos from 1961 to 1963. Each of the original maps covers a 1:50,000 NTS sheet at a scale of 1:63,360.
To download the georeferenced orthophoto maps you will need to use FTP software such as FileZilla (available free online). Metadata Download: http://www.abmi.ca/home/publications/351-400/376.html
Ftp server: ftp.public.abmi.ca
user name: web|anonymous