Photographer Helen Levitt spent nearly 70 years shooting street photography in NYC. She had an eye for capturing private, tender moments that would otherwise go unnoticed. According to her Wikipedia page, she has been called the most celebrated and least known street photographer of her time.
Book #15 is hidden in the lower east side. Near the corner of Stanton and orchard are two faded blue boxes. One hides your disguised book. Have a seat and look carefully.
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Transmissions From The Wastelands 
Got it book #15-20
Congrats man!
Thanks great thing your doing!!!!!!!!!!
Congrats on finding #15
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