How do I fix librarIES ?

Question

I have Aper 3.1.1 (newbie). I don't know how I did this but more importantly how do I fix it?
Some how I have 2 Aperture Libraries. They are both on external hard disks (which is where I want IT, my Aperture (one, single, newest) Library).
They are:
ApLib 14.26GB, modified yesterday 2/20, on Iomega 1TB HD
ApLib 14.63GB, modified 2/15, on Iomega 2TB HD.
I want only one ApLib and I want it on the Iomega 2TB HD.
Should I just erase the ApLib on the 1TB disk? but it was just modified yesterday; I assume it is the more uptodate library. The library now residing on the 2TB disk is out of date, right?
But that is where I want my single, up-to-date Aperture Library to be.
Can someone tell how to get out of this "monumental" mess, please? TIA

Answer 1

I selected Import Library. Aperture then asked if it should Merge or Add the library (coming from my 1TB HD). I selected Merge. It looks like I have doubled most of my images. Otherwise, the ApLib looks to be intact.
I then dragged the (good, desired) library from the 1TB HD to the 2TB HD and did a replace of the older library there.
Closing Aperture and taking the 1TB HD off line, when I re-opened Aperture I got a window which said it could not locate the library but gave me a list of my Aperture Library(s) including the one I wanted on the 2TB HD. (I since deleted the library from the ITB disk, and am using it as backup for Aperture and some other files.)
Everything appears normal and as I want it (with a lot of duplicates).