Fourth in a series of reports on the status of the control net of Mars. The net is determined from photogrammetric computations using 9,804 measurements on 660 pictures taken by the Mariner 9 spacecraft. This report gives the latitude and longitude of 1645 primary points in the control net, and the geographical distribution of the points is shown in two figures. (See also R-896, R-1122, R-1252, R-1266.) 95 pp. Ref.
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