People collect just about everything

So the other day I was in the local goodwill and of course I wasn't able to find anything decent so I decided to check out the books section. So I got there and there was this lady with a notebook checking out the books. I was curious of what she was doing since she was writing down a lot of info into her notebook. She saw I was looking at her and said "I collect children s book" and I was like "Oh that's really kewl". It's amazing that people can find a hobby with pretty much anything. I'm also wondering where could she find a master list for all children s books so that she can check off which ones she finds. It's interesting to find people like that you know....