Canon of Nature Photography?

You know how they talk about a "canon" of literature that every American should be familiar with? How about a canon of nature photography -- the books that every nature photographer should have on the bookshelf?

I'm not sure if there's a practical way to compile such a list, but it could be interesting. I'd start with my own photography book list, but I'm not near my books as I write this, and if I don't post it now, I'll probably forget later.

Any takers? We could amass the suggestions and pick the 10 or 20 that come up most often.

Here's a start fom a recent thread titled 'Good Landscape Books'.