Mystery Of The Spiral BridgeMystery Of The Spiral Bridge (1970) Episode HB-21- Hardy Boys Cartoon Episode Guide by Dave Koch
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- Filmation Associates
- Hardy Boys Episode Guide Pictures
- Featuring: Joe Hardy, Frank Hardy, Pete Jones, Fenton Hardy, Chubby Morton, Wanda Kay Breckenridge, Aunt Gertrude Hardy.
- First Aired on October 03, 1970.
- Originally Aired on ABC-TV (USA).
- Running Time: 30 minutes.
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