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Amazon has a better "Customers Who Bought This ..." set-up than B&N. Faster with more choices. So Jan's customers probably searched for other titles and Amazon linked his book with their purchase.
Comparing the 2 sites. On Amazon Jan has more reviews and most positive with 20 other recommendations. B&N has only 7 anonymous reviews with no text just a rating and only 1 other recommendation. He's rating is slightly lower on B&N.
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