https://media.bookbub.com/blog/2016/02/03/signs-youre-a-library-lover/
One of the best things about being in SLC my Senior year was the SLC Library. My English teacher had written her thesis on what was the earliest meeting of Elizabeth Barrett and Robert Browning in person, I went to the SLC Library. I normally started with the Dewey Decimal System book, a giant, luckily they had one. I stood where it had directed for over an hour (courtesy and respect to her), then I removed the bottom rows books and reached down through the gap between the books backs, ta-dah, rare books under the floor; not in the card catalog but in the Dewey Decimal System. I reserved one for her with a bookmark. Addendum.
Thanks John Kenyon, May 20, 1845
Thanks Melvil Dewey