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The Seekers - 1979 TV is rated/received certificates of:
Iceland:12
THere is no fourth book. The series of Seekers is composed of three books.
The Seekers at Home - 1966 TV is rated/received certificates of:
Australia:G
The Treasure Seekers - 1996 TV is rated/received certificates of:
Netherlands:AL (2009) (DVD)
California and the Dream Seekers - 1998 TV was released on:
USA: 18 January 1998