Top memory books:

https://www.barnesandnoble.com/w/my-first-million-digits-of-pi-sancy-suraj/1129947371?type=eBook
https://itunes.apple.com/us/book/my-first-million-digits-of-pi/id1444950453?mt=11
http://www.abnewswire.com/pressreleases/pinnacle-minds-founder-sets-guinness-world-record_6117.html
https://www.amazon.ca/My-First-Million-Digits-Pi-ebook/dp/B07KVGB4RX

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