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I have one of these inexpensive Ikea bookshelves for storing some of my
electronics books:

<https://www.ikea.com/us/en/p/laiva-bookcase-black-brown-40178591/>

I noticed the center shelf was starting to sag a few degrees. :( The 
assembly manual specifies a weight limit of 33 lbs evenly distributed 
which seemed like an oddly specific number. So I weighed the books on 
the shelves, which aren't particularly well organized other than to 
fully fill the available space widthwise on each shelf.

A random assortment of hardbacks and paperbacks, some are tall and 
skinny, some are short and fat. And each shelf was clocking in at 33 lbs 
+/- 2 lbs.

So I guess a heuristic for filling these shelves is just fill 'em up 
then remove the heaviest book, and de-rate the center shelf by maybe 5- 
10 lbs because it's unsupported by a backing.