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In page Murfreesboro, Arkansas:

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In 1906, diamonds were found on a local farm. It was determined that an 80-acre (32 ha) volcanic formation was the source of the diamonds.[citation needed][1] The property was eventually sold to the state of Arkansas, which opened the 37-acre Crater of Diamonds State Park to the public.[citation needed][2] As a tourist attraction a daily fee ($10 in 2021) is charged to search for diamonds.[citation needed][3]