Synonyms were used for:
orbits
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Space Vehicles Launched Between 1 September and 31 December 1970, Supplement
Space Vehicles Launched During 1973
Table of Earth Satellites, Volume 2, Parts 1, 2 and 3 1969, 1970 and 1971
Table of Earth Satellites. Volume 2, Parts 1 and 2 1969 and 1970
Table of Earth Satellites. Volume 3: 1974 to 1978
Table of Earth Satellites. Volume 2: 1969-1973