|^ Publication for sure. All new copies of the series are published in chronological order, so you just have to ignore the numbers on the spine.
Publication order is:
1. The Lion, the Witch, and the Wardrobe (1950)
2. Prince Caspian (1951)
3. The Voyage of the Dawn Treader (1952)
4. The Silver Chair (1953)
5. The Horse and His Boy (1954)
6. The Magician's Nephew (1955)
7. The Last Battle (1956)
But, but, but the numbers command it, and it must be so!
I am a Star Wars fan. That doesn't mean that I hate or love Jar Jar. That doesn't mean I hate or love Lucas, or agree or disagree 100% with him. That doesn't mean I prefer the PT over the OT, or vice versa. That doesn't mean I hate the EU, or even love all of it. These are not prerequisites. Being a man is not a prerequisite. Being a geek is not a prerequisite. The only prerequisite is that I love something about Star Wars. I am a Star Wars fan.
Life is like the Force - Luke Skywalker, Crucible. Damn straight I am.