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A river, about 700 km (430 mi) long, rising in eastern Wyoming and flowing generally eastward to the Missouri River in northeast Nebraska.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||Niobrara River - a tributary of the Missouri River|
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