Homebrew PCBs

Hi everybody
  Another Eagle question for the experts:  I so often wish I could 
get packages and symbols from one library file to another, thereby 
preventing me from having to do a lot of work re-drawing parts in my 
own custom library that are right there in another one.  I have 
looked forever, but haven't been able to find a way to copy or 
import/export from one library file to another.  Is there?

Thanks

Josh DeWinter
Pullman, WA