I have some of the correspondence but not others, for some reason. I went digging through my email and found these - this was from 2014. Most were 'Google Research' links.

“Programming Interviews Exposed: Secrets to Landing Your Next Job"

Authors: John Mongan, Noah Suojanen, and Eric Giguère (Wiley Computer Publishing)

"Programming Pearls"

Author: Jon Bentley

"Introduction to Algorithms"

Authors: Cormen, Leiserson, Rivest & Stein