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Welcome to the Encyclopedia of Arkansas
This Day in Arkansas History
October 8, 1941
The U.S. Department of War informed Representative Oren Harris of Arkansas of the approval for a $23 million ammonia plant to be located near El Dorado (Union County). One of six such ordnance plants in Arkansas during the World War II years, it became known as the Ozark Ordnance Works and was the first plant in the United States to use natural gas to produce ammonia.
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About the Encyclopedia
The CALS Encyclopedia of Arkansas is a free, authoritative source of information about the rich history, geography, and culture of Arkansas. It is updated regularly to ensure the people of Arkansas have an accurate and accessible resource to explore our heritage. We invite you to browse our text entries and media galleries to learn more about the people, places, events, legends, and lore of the 25th state. We are continually adding new entries, photographs, maps, videos, quizzes, lesson plans, and more, so check back frequently to see what’s new.
Our overview page covers everything you would want to know about our beautiful state, including state symbols, demographics, and more!
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