selecting photos based on exposure bias

I use auto-bracketing for all my shots, and therefore have triplicates of all my photos in my iPhoto library (ILife '09).

Is it possible to automatically select only those images with a given exposure bias (say zero, or +1) and move them

to a separate album, or do I have to go through my entire library and manually select the photos that match my

criteria on exposure bias? I would prefer to avoid this manual solution as that would be a lot of time and effort.

Thanks for any hints,

Catherine