Recently Dave Giles linked to an old blog post on his wonderful Econometrics Beat about plotting the data before running regressions. This is a habit drummed into me at an early age but youngsters don’t seem to always do this.
Dave mentions the well-known Edward Tufte books, The Visual Display of Quantitative Information and Envisioning Information. (I think I have the entire Tufte oeuvre.)
I like Howard Wainer’s books also: Graphic Discovery and Picturing the Uncertain World. I don’t have his latest, Truth or Truthiness: How to Think Like A Data Scientist, and might need to remedy that.