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It depends on the ballet
Belles and Ballet - 1960 was released on:
USA: 20 July 1960 (Chicago, Illinois)
The Royal Ballet - 1960 is rated/received certificates of:
Finland:S
Queensland Ballet was created in 1960.
Popeye the Sailor - 1960 Ballet de Spinach 1-56 was released on:
USA: 1960