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GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Convertio - File Conversion in the Cloud
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Most Recommended Books - Books recommended by the world's most successful people
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.