What is your Top 20

I belong to the GoodReads group The Book Addicts, "We are "The Book Addicts." We know we have a problem and we are proud of it. If you love to read and can't seem to stop buying books, plz join us."

I tell you this because someone in the group said something about wouldn't it be nice it we had our own top 100 books? There are over 800 members and even choosing our top 5 didn't include enough overlap among those that voted to have a group top 100. Expanded to 10, now it's 20.

I have until Monday to pick 20 titles to include in my personal Top 20. YIKES. In case you missed that... YIKES!!! I have a hard time deciding on favorite authors and you want me to narrow it down to 20 books? YIKES
The best way for me to do this would be to walk around my shelves and start writing. Unfortunately, not all my books are on shelves. I always seem to go oh-I-remember-that-one and that-one-was-fantastic when I see someone else's list. That's where you come in.

What does your Top 20 Books of all time list look like?

Childhood favorites, current reads, doesn't matter. If you were building your library from the ground up, and all titles were available, what would be the 20 titles you would absolutely HAVE to have in your library. Do keep it real, a 1435 Book of Hours or something like it just isn't going to cut it.

Don't list "Harry Potter", list your favorite title out of the series or list them all. Not even "anything by author's name". I need titles. Go ahead and fudge some, list your top 30, top 50 if you'd like.