To quote the Online Computer Library Center "Want to dig deeper? Explore a list of the top 500 novels held in WorldCat libraries to find more of your favourite genres and authors".
This is the first part of an extended version of the challenge published recently by KS - that list covered the first 100 books. Thanks to KS. For the sake of completeness I have repeated those first 100 novels. I have also published the 2nd part of the challenge, covering novels 251-500.
If you follow the link you will be able to click on titles you are interested in and you will be taken to WorldCat. If you have previously set up WorldCat with your location, you will be able to peruse a list of nearby libraries that should have that work in their collection.