I judge these books by their covers.
Every year, there are usually two book sales at our local library.
There are mountains of these books: readers digest condensed books.
They are mostly from the 1950's-70's. I fall for these covers pretty much every time I go.
The best part: there are so many, that they are FREE, and the salespeople cheer me on each time grab as many as possible, and stagger repeatedly down the block with haul after haul.
When I see the ones from the 1950's (so gorgeous), I snag them right away, as I seldom see the same ones again.
I have some projects that use these vintage books, that I plan to share here in the near future.