Usage Reports are available by clicking on Reports in the left sidebar of Resource Lists. If at first it doesn't load, try again!
The Analysis tab shows high level usage of your Published Resource Lists:
The Usage tab shows more detailed infromatin about your Resource Lists's usage:
Under the List Name column, click your Resource List and choose a deeper view, either by Sections, Citations, or Citation Types:
Viewing Reading List Citations will show you a detailed report on how students are engaging with the course's assigned materials: