REFINE     Who What Where When     REMOVE National Atlas Text Page Geography 1955 WHAT Data Visualization (2) Thematic Atlas (2) WHERE Canada (2) WHO Canada. Department of Min … (2) Comtois, Paul (2) Department of Mines and T … (2) Nicholson, N. L. (Norman … (2) WHEN 1958 (2)

REFINE  Browse All : National Atlas and Text Page and Geography from 1955 1-2 of 2 Canada. Department of M... Text: (5) Extent of top... 1955 [National Atlas, Themat...   Author [Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul] Note Descriptive text on verso of (5) Extent of topographical mapping, 1955: The purpose of this plate is to show the extent to which Canada has been mapped on relatively large scales - 1:1,000,000 (15.783 miles to 1 inch) or larger ... Canada. Department of M... Text: (4) Extent of map... 1955 [National Atlas, Themat...   Author [Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul] Note 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 geometric means which, in effect, consist in solving triangles ... 1-2 of 2

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