Date Span
n.d.
67
n.d. [c.1975-1980]
26
1949
8
1938
6
1945
6
1961
6
1965
6
[19--]
6
1948
5
1948-1949
5
1962
4
1965-1966
4
[196-?-197-?]
4
[1969]
4
1910
3
1928
3
1930
3
1932
3
1943
3
1961-1962
3
1966-1967
3
1967
3
1971-1975
3
1977
3
1979
3
ca.1893
3
n.d. [1919-1923]
3
[1925]
2
n.d.
2
10-15 July 1978
2
1908
2
1909
2
1909, 1914
2
1911
2
1913
2
1926
2
1931-1932
2
1943-1948
2
1944
2
1944-1950
2
1946
2
1947
2
1948-1950
2
1950
2
1956-1970
2
1957-1966
2
1957-1974
2
1960-1961
2
1963
2
1963-1965
2
more ...