(Text Page to) (4) Extent of mapping surveys, 1955 : Legal surveys -- Geodetic surveys -- Air photographic surveys -- Geodetic surveys. (Canada Department of Mines and Technical Surveys.)
Descriptive text on verso of (4) Extent of mapping surveys, 1955: In carrying out mapping surveys, it is necessary to have control points precisely located from which the surveys can be advanced. Control points are established primarily by astronomical fixations; thereafter they are established by g...
| Main Authors: | , , |
|---|---|
| Format: | Text |
| Language: | unknown |
| Published: |
Department of Mines and Technical Surveys, Geographical Branch
1955
|
| Subjects: | |
| Online Access: | https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~323151~90092329 https://media.davidrumsey.com/MediaManager/srvr?mediafile=/Size4/RUMSEY~8~1/185/14001013.jpg |