1971
1969
1973
1970
(1962); 1982
1972
2000-100 BCE
circa 1972
1990-96
1986 (replica); 1501-1600 (original)
1974
1970-1972
1970-1971
1973-1974
1969-1970
4000-2001 BCE
1903 (original); 1982 (model)
About 1970
circa 1973
1970 and post 1989
2686-2613 BCE