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2. Geod. Memo.;Carlson,1971
3. Cubic Corp. San Diego, Calif. Orbital constraint network adjustments for geodetic solutions final technical report, contract DA-49-018-ENG-3094 140 1966
4. Cubic Corp., San Diego, Calif. Ruggedized geodetic Secor, final technical report contract DA-49-018-ENG-2390 300 1964
5. G. H. Dudley M. A. Warden Secor results of Geos A comparison tests 11 1968