Robert N. Mullin (1893–1982) was a writer of Western history and the author of several publications about Billy the Kid, and the Lincoln County War.
Robert Norville Mullin was the son of Joseph P. Mullin and Charlotte Norville.
He married Josephine Plumridge in 1916.
In his early career, Robert N. Mullin lived in Toledo, Ohio, and was a senior executive of a Chicago oil company.
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