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