Space Voyage Covers

Work in progress – March 2020. Still trying to figure out what Space Voyage covers I have / don’t have. Is there a catalog or listing of all these covers somewhere ?

Year-by-year issues of Space Voyage Covers in my collection:

1969  |  1970  |  1971  |  1972  |  1973  |  1974  |  1975  |  1976  |  1977  |  1978  |  1979  |  1980  |  1981  |  1982  |  1983  |  1984  |  1985  |  1986  |  1987

Also see Lunar Voyage  and Inter Space covers which are very both similar.