A lot of this is also formal training. My first "job" in high school was working at the local public library as a "page". A couple of us joked about working our way up to a "chapter" if we really stuck with it !
My "career" jobs at the US Army Corps of Engineers and the University of Michigan College of Engineering relied heavily on the ability to rapidly find and evaluate information. We were data mining before there was an internet and a fair amount of the actual data was still in paper/image form. You had to understand the indexing systems and how the indexes related to each other. The goal was to find the ten nuggets you were looking for and that you could paw through by hand out of the tens of thousands of "records" that were actually stored as 1.1 million pictures/images on microfilm.
Roger, you're very welcome.
Roy, I agree completely, it's complicated.
Robert, our gas taxes are among the highest of the Great Lakes states and most of it isn't even going to fix the roads which is why they are literally falling apart.
Mitch, thanks for the kind words.

