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Mark Harmon - Wikipedia
Mark Harmon - IMDb
Mark Harmon: Biography, Actor, NCIS
Mark Harmon Opens Up His 'NCIS' Departure After 19 Seasons
Mark Harmon to Appear on 'NCIS: Origins' Premiere - People.com
Mark Harmon Opens up About His ‘NCIS’ Exit for the First Time
What to Know About the 'NCIS: Origins' CBS Prequel Series
Mark Harmon Bids Farewell to NCIS After 18 Seasons
Mark Harmon on 'NCIS: Origins' new Gibbs Austin Powell, series …
Mark Harmon Steps Away From ‘NCIS’ Role After 18 Years - Variety