John, have you tried the Maryland Stock Car racing Historical organization?
(I believe there was another driver (Yates) from Hyatsville, MD)
http://www.mdscrhof.org/
Your dad sure had a long and prolific driving career.
from the Daytona Beach Road Course of the 50s into the 70s and a late model championship at Beltsville's Friday night venue (car #00 ?)
