Amazon Search Inside the Book Submission
Amazon itself has stated that books participating in the Search Inside the Book program are significantly more successful, on average, than books that do not participate.
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Increase Book Sales by Activating Amazon's "Search Inside the Book" Feature
In the digital age, where most book shopping occurs online, it's hard for readers to make the decision to buy a book without being able to thumb through the pages—now you can let them do just that! Our Amazon Search Inside the Book service allows you to take advantage of Amazon's online equivalent to browsing in a bookstore and flipping through a book.
Books that participate in the Search Inside the Book program feature a "Look Inside" icon over their Amazon cover image, inviting potential readers to virtually "flip" through a small section of your book—which has the potential to turn browsers into buyers!
According to Amazon, books participating in this program enjoy significant sales improvement over books that do not.
Also, when you participate in the Search Inside the Book program, Amazon digitally catalogs the text of your book - which results in more accurate and targeted search results and recommendations. Exposing more readers to your book, and increasing your potential for book sales.
And, at the end of your sample, Amazon features other book's you've written to encourage interrested readers to buy your other books as well.