All published versions of units and lessons are saved in the revision history and can be restored.
1. Login to your School Loop account and access one of your classrooms.
2. Go to Curriculum tab -> title of the document -> Clock icon on the right to view a list of all saved versions.
3. Use the links in the revision history to view a version.
4. Click the Make Current button to restore the version.
The old version should now be restored.