The '70s saw a "rural purge" in TV programming. What was the only other Western to last longer than Bonanza?

The '70s saw the emergence of urban-centric programming and a purge of rural-themed shows like Bonanza. Maude, starring Bea Arthur, is what finally dealt Bonanza its deathblow in 1973. However, Gunsmoke outlasted all other westerns, running for two decades.

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