By default when you go into the Purchased Content on your eDGe through your library, the list is set to display books that are not yet downloaded. It is possible that because your downloaded started and then your WiFi crashed that the system thinks they were already downloaded.

If you could try the following:

Go to the Purchased Content section through your library. Once there on the left hand side, towards the top of the screen, it should say "Not Downloaded". Below that you will see an icon that looks like a hard drive with a down arrow on it, select this icon. From the list that comes up, select "All Purchased Content". Hopefully your books will appear there and you will be able to download them.