Hinks, Arthur R. (Arthur Robert), 1873-1945 · Cambridge, University press · leaf 50
fails only when the contours come so closetogether that there is not space to draw the figures betweenthem. In such cases, and in no other, the number must beinserted in the line of the contour. A close scrutiny is thenneeded to discover in which direction the numbers increase, andthe map is much… … In Outline, without Hills
Maps · Surveying
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