Longest U.S. Rivers by source & mouth

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Name the longest U.S. rivers by source and mouth.

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Jefferson River, MontanaMississippi River, Missouri
Columbia Lake, British ColumbiaPacific Ocean, Oregon-Washington
Allegheny River, PennsylvaniaMississippi River, Illinois-Kentucky
Rocky Mountains, WyomingColumbia River, Washington
La Poudre Pass, ColoradoGulf of California, Baja California-Sonora
Rocky Mountains, ColoradoMississippi River, Arkansas
Atlin Lake, British ColumbiaBering Sea, Alaska
Lake Itasca, MinnesotaGulf of Mexico, Louisiana
Buck Creek, OklahomaAtchafalaya & Mississippi Rivers, Louisiana
Canby Mountain, ColoradoGulf of Mexico, Texas

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