Best of the burden: Smokies mules make backcountry operations possible
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George Washington Saw a Future for America: Mules | History| Smithsonian Magazine
The cowboy way: Unpredictable mules vital to survival in Arizona's remote Saguaro National Park
two mules and a pile of dirt... - Bible Walking
The Wolfgang Press the Burden of Mules Limited Edition - Etsy
Marines' beasts of burden are again leading the pack - Los Angeles Times
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Army Mules: The Beast of Burden in War - Warfare History Network
