[gentoo-user] see what's been emerged

[James]

All,

I posted this question about a year ago and can't find the email or
answer for the life of me...so I'll try again. :)

I'm trying to find a file or database that keeps track of everything
I've emerged since I set my system up, preferably in chronological
order.

Where / how can I obtain this information? I know that portage keeps
track of it somehow.

Thanks!
-j