I am trying to find a reference that will tell me, for each state, how many linear feet of individual state law books are on library shelves. Talk about esoterica!
I did some research recently on Wyoming state laws and found that the subject that I was researching didn't even have a reference. I wanted to know if the state regulated home owner's associations.
There are about 3 linear feet of state law books on our library's shelf, including the index and addendums. I would guess that California, for example, would have 30 linear feet of law books.
And don't get me started on U.S. government laws!

What should I Google to find this info?

Hhmmm, well, having worked in a law library in the past, I can tell you that whatever the figure is, it would be constantly changing!
Every day I would have to go through lots of books and do "loose-leaf filing"--taking out pages and adding others, adding whole new chapters, etc.
It ammazed me how much minutia was actually changed. Sort of annoying, really, that we pay all these people to spend time doing things like changing "a" to "an". Or sometimes they'd reword a piece of law, using strikeouts in the text along with the new text--then a week later, receive the same pages with only the new text. Like they couldn't do just one or the other?
Ah, sorry, that was a bit of a tangent, but I'd be interested in the answer to your question if you find one.

I once read an interesting comparism between the 'Ten Commandments' and European legislation dealing with 'straightness of cucumbers', or was it 'bendiness of bananas'. Anyway the former was about half a page, and the latter a pile ten feet thick!

I wonder if the banana/cucumber people have a counterpart in the U.S.? I can visualize an obsessive/compulsive book worm traveling the States measuring the law books shelf space and carefully entering the measurements in a worn ledger.