In order to request books through OhioLINK or SearchOhio, you will be prompted for your name and barcode number. Your library barcode number is the 14 digit number on the back of your Wittenberg ID (OneCard). You can also access your barcode number by logging into Self Service and looking for the tab that says "User Options", then click on "User Profile". You will see a barcode with your library barcode number underneath.