On May 25, 1963, running for the University of New Mexico at the Western Athletic Conference Championships in Tempe, Arizona, Plummer shocked future Olympic champion Ulis Williams on his home track and beat Glenn Davis's five year old record by 8 tenths of a second, clocking a 44.9. Plummer's only memory of the race was hearing the starter say "set" before the race began. Plummer's time was also fast enough to tie the existing world record in the shorter 400 metres, the last time the same record stood for both events simultaneously.
- Garcia, Nasario (2005). Saints & Seasons: A Guide to New Mexico's Most Popular Saints. United States: La Herencia Publishing. p. 67. ISBN 0974302260.
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