jhites' link is for P3's. For all P3's, be sure to note the link at the bottom of the Intel S-spec page that takes you to the updated listing. Or check
this.
The Intel Celeron S-spec chart is
here. Note also the update link at the bottom of the page.
Personally, I've never seen a page at AMD's site like those Intel sites above. I guess AMD doesn't admit to having steppings.