"Bush seems to have said little in his published work about the antecedents of his Memex or of his microfilm rapid selector" - Buckland wrote a nice article summing it up: http://people.ischool.berkeley.edu/~buckland/goldbush.html

Shameless plug: Goldberg's life story and his search/pattern detection machine was the main inspiration to create Revealer - https://revealer.cc