Transferring ePub files from iPhone to PC?

I downloaded a number of books directly on my phone through Safari as ePub files, and opened them in iBooks. Now, I would like to copy the files to my iPad as well and within the next month or so I will probably be upgrading my phone, too. However, since they are not "purchases" (aka I didn't buy them off Apple's book store) I can't figure out how to sync them with my PC.

If there's a way to email them to myself that would work too as I could just use the download link on my iPad, same as I did on my iPhone.

For reference, I have an iPhone 3GS running the newest release of iOS 6, an iPad 1, and a PC running Windows 7 & the newest version of iTunes.

I haven't done this in a while, but I think you can go to the device info when you plug it in and move files there.

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