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 / Updated  / Source: CNBC.com

Amazon.com on Friday debuted Kindle Unlimited, allowing customers to access more than 600,000 Kindle books, and listen as much as they want to thousands of Audible audiobooks for $9.99 a month. Kindle Unlimited subscribers will also receive a complimentary three-month Audible membership from all Kindle devices or with Amazon's free Kindle reading apps.

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-- CNBC.com