Merge libraries on FCPX

Hey all,

So for the past year I have been backing up my FCPX purely by copying the library onto an external drive, so now I have multiple libraries, mostly overlapping in projects.

Although I don't really need to archive the footage (as most of it was kept seperate from the library anyways) my question is:

Is there a way to merge all these libraries (or just projects) into one library so that I no longer have these duplicate files taking space and only have the newest version of each project I have done?

Thanks!