This is a set of three maps. The main map shows areas for which there are 1:50 000 scale National Topographic System (NTS) map sheet coverages up to October 1970. This map also denotes whether the NTS sheets were published maps or advanced prints (an advance print is a monochrome reproduction of the map manuscript). The second map shows areas for which there are 1:25 000 scale NTS map sheet coverages up to October 1970. The 1:25 000 scale NTS map sheets are all denoted as being published maps. The third map shows areas covered by the 1:1 000 000 International Map of the World (IMW). The IMW sheets are also denoted as being published maps or advance prints. A supplementary text providing additional information on topographic map coverage of Canada up to October 1970 accompanies this map set.
