Sometimes your professor will place an article or book chapter he or she wants you to read on eReserve. This prevents you from having to find (and purchace) the material yourself. EReserves can be accessed from any computer with an internet connection.
If your professor tells you to read materials on reserve (or eReserve), just use the Course Reserves link on the library webpage to find them.
Use the Reserves option in the library catalog drop down to search for your course prefix (i.e. STAT251, SOC311, etc.)