Actually this can be said about most famous photographers. I've notice that whenever I check, it's always the same pictures they are more famously identified with and which draw the highest prices. It's usually a dozen maybe two dozen pictures. That's it. The upside of that is we only need that many too to become famous like them. The downside is that we have to shoot as many bad pictures as they did as well to get there.
The same goes for painters.....only they 3-5 paintings that speak to the ages!