The Hitch Hiker's Guide to the Galaxy question

Hi there,
I'm doing a blog post for a PBS web site, and the piece will mostly be curated from people out there just like you so let me know if you'd like to be quoted for this!

The question, for avid readers of paperbacks: Do you have favorite ol' paperback book you still keep around for nostalgic purposes or for whenever you need comfort? (For example, I still have Hitchhiker's Guide paperback from my youth around and flip through it once in awhile for laughs and nostalgic comfort.) What's a book from your younger days you just can't part with and why?

Note: If you are OKAY being quoted from here for this blog post, say so in your comment. It's okay to also just post here for purposes of discussion and not be put in my blog post. :) But if you wanted to be quoted, i'll just use your first name and last initial, and your city.

Thanks!