His invention made him a millionaire after it went on sale in 1975
Gary Dahl, Creator Of The Pet Rock, Dies At 78
Candace Dahl's Instagram, Twitter & Facebook on IDCrawl
Pet Rock Inventor Dead: Gary Dahl Dies at 78 – The Hollywood Reporter
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Creator of a craze: Gary Dahl, inventor of the pet rock, dies at
Gary Dahl dies at 78; creator of Pet Rock, 1970s pop culture icon
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