Message from Karen Smith, Little Ness.
It means you read a book containing one of the items on the list, so you end up reading 52 books, not one book containing all 52 items. Does that make sense? For example the book I'm currently reading is set in Spain so I can cross off number 35. If my next book is by Dickens, I can cross off number 4.
I have a huge to read pile so I find these a fun way to choose my next read or look for a new one on my Kindle.