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1. Sharing feature for Facebook, Twitter, or Email.
2. Go To Feature for all the books: Ability to jump from book to book and chapter to chapter within a book.
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The Treasury of David, Volumes 1 and 2 (of Six Volumes) by Charles Haddon Spurgeon:
This 2 Volume collection of commentary on the Psalms of David is the crown of Charles Spurgeons work.