Document Library question

[Shabal]

Hi,

I have created two different document libraries (lib 1 and 2) in different areas. Now, I'd like to create one document library (lib 3) in another area that includes documents from both libraries.
In other words:
*Lib 3 will include all documents added in lib 1 or lib 2.
*Lib 1 does not include the documents added in lib 2, and vice versa.

Thanks for the help!
Shabal