U.S. Forest Service Packers Serve Fire Crews - Western Horseman
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Army Mules: The Beast of Burden in War - Warfare History Network
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U.S. Forest Service Packers Serve Fire Crews - Western Horseman
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Hybrid (biology) - Wikipedia
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James Reeves: The Mule Packer | The Filson Journal
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What Is A Mule? 13 Things You Didn't Know | SPANA
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Mule talk
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History of the Mule - American Mule Museum
