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In page Buck Jones:

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His star waned in the late 1930s when singing cowboys became the rage and Jones, then in his late 40s, was uncomfortably cast in conventional leading-man roles.[citation needed] He rejoined Columbia in the fall of 1940, starring in the serial White Eagle (an expansion of his 1932 feature of the same name). The new serial was a hit and Jones was again re-established. His final series of Western features, co-produced by Jones and his friend Scott R. Dunlap of Monogram Pictures, featured The Rough Riders trio: Buck Jones, Tim McCoy, and Raymond Hatton.