Four aspects of Course Reserves for students.
In general, these are individual books or objects the whole class has to share, like a time-share.
Your professors expect you to use them for at least a few hours as part of your research or weekly readings.
They may contain notes from previous readers, rare books, or part of your assigned texts.
You may need to schedule or plan ahead with classmates about who prefers early mornings, late evenings, weekends, etc. so everyone has time with the book.