Is it possible to get a list of all books I read the past 12 months?
That is possible if you have activated the "Borrowing History" option in your library account. To do this, you log in under My OPL (top lefthand tab on the omahalibrary.org home page). Once logged in, click on My Settings (top right corner, next to your username). The Borrowing History option is under Privacy. If it is enabled, the system will save a list of everything you check out from that moment on (visible only to you). However, it will only begin keeping track from the moment you enable it. There is sadly no way to retrieve a list of the books you checked out before enabling Borrowing History.
I hope this helps!