Aerial survey data base [Canada] : current and planned coverage = Banque de points de canevas photogrammetriques [Canada] : coverture actuelle et prévue.
Canada.Surveys and Mapping Branch.
[Ottawa] : Department of Energy, Mines and Resources, Surveys and Mapping Branch,
1984-89.
2 classes of available adjustments; projected coverage available for future years.
"Internal working document"--below legend.
Published annually.