REFINE     Who What Where When     REMOVE Thematic Atlas Geography 1955 WHAT Data Visualization (4) National Atlas (4) Atlas Map (2) WHERE Canada (4) WHO Canada. Department of Min … (4) Comtois, Paul (4) Department of Mines and T … (4) Nicholson, N. L. (Norman … (4) WHEN 1958 (4)

REFINE  Browse All : Thematic Atlas and Geography from 1955 1-4 of 4 Canada. Department of M... (5) Extent of topograph... 1955 [National Atlas, Themat...   Author [Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul] Note 4 maps showing Canada at different scales. Each map 23 x 32 cm. Each includes a scale statement. Lambert Conformal Conic Projection Standard Parallels 49˚N and 77˚N. Descriptive text on verso: 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: (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 ... Canada. Department of M... (4) Extent of mapping s... 1955 [National Atlas, Themat...   Author [Canada. Department of Mines and Technical Surveys, Nicholson, N. L. (Norman Leon), Comtois, Paul] Note 4 maps showing different sets of survey data of Canada, including legal, geodetic and air photographic surveys. Each map 23 x 32 cm. Each includes a legend. Scale 1:20,000,000 or one inch to 315.6 miles. Lambert Conformal Conic Projection Standard Parallels 49˚N and 77˚N. Descriptive text on verso: 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 ... 1-4 of 4

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