Update on 2019-03-15: fix missing book titles.
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Top Books on Stack Overflow
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Top Books on Stack Exchange - Mathematics
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Top Books on Stack Exchange - Science Fiction & Fantasy
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Top Books on Stack Exchange - Cross Validated
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Top Books on Stack Exchange - Physics
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Top Books on Stack Exchange - Software Engineering
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Top Books on Stack Exchange - English Language & Usage
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Top Books on Stack Exchange - Role-playing Games
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Top Books on Stack Exchange - Electrical Engineering
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Top Books on Stack Exchange - Server Fault
