Availability 404 Errors - 10-FEB-2014 - UPDATE 14-FEB-2014
OverDrive API Partners
We have identified the cause of the missing availability data, updated all missing data, and deployed patches to prevent this in the future. This issue is now resolved. As a reminder, you can file a support request at https://developer.overdrive.com/support/support-form if you experience any issues using the OverDrive APIs.
-The OverDrive API Team