Date Span
n.d.
183
[19--]
53
circa 1977 - 1979, n.d.
41
ca.1968-9
22
circa 1948 - 1954, n.d.
20
n.d. [c.1975-1980]
16
1970
14
1970 - 1971
14
1967
12
1950s
11
1965-1966
11
1969-1970
11
1969 - 1971
10
Twentieth Century
10
1937
8
1969
8
1962
7
1972
7
1957
6
1965
6
1966-1968
6
1971
6
1973
6
1974
6
1983-1995
6
1992-1995
6
1996
6
1934-35
5
1938
5
1939-40
5
1952
5
1959-1970
5
1960-1961
5
1967-1968
5
1968-1969
5
1970-71
5
1971-1993
5
1977
5
1995
5
1996-2001
5
20th century
5
n.d. (1930s)
5
1871-1908
4
1958-1959
4
1963
4
1964-1969
4
1965-1969
4
1968
4
1969-1971
4
1979-1980
4
more ...