Len Williamson was my dad. He and my uncle drove from Oklahoma to Detroit, Michigan in the late 80s and made copies of all of the records that Chevrolet had with their permission.
The first set of 2 volumes contained production numbers and options for all passenger vehicles from 1953-1988. He was sent annual updates until 1993 and Chevrolet stopped sending the data. He didn't get rich by any means by selling these books. He just wanted to share the information.
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