1949-12
1951-04
1952-01
1953-08
1954-04
1954-06?
1954?
1955?
1957-12
1958?
1960-12
1961
1962-03
1962-12
1963-12
1964-06 ...
... 1964-06
1964-10
1964-12
1966-06