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William Mark McCullough - IMDb
‘NCIS’ star David McCallum dead at 90 | CNN
Robert Horton (actor) - Wikipedia
Mark McCullough: In his own words | South Magazine
Ian McCulloch (actor) - Wikipedia
WILLIAM MARK MCCULLOUGH - Resume | Actors Access
Robert Horton, Handsome ‘Wagon Train’ Star Who Wanted …
INTERVIEW: William Mark McCullough - Actor, Writer, Director
William Mark McCullough: Movies, TV, and Bio - amazon.com
William Mark McCullough List of Movies and TV Shows - TV Guide