In microfilm, 3rd floor. Only at workstations within the Library. On the Library's web page, either inside the Library or via remote connection. Only at workstations on the Reference floor. Call numbers are useless, don't bother.
Call numbers are unique to each item.
Call numbers provide location information. Call numbers are both unique to each item and provide location information. Using a workstation in the Computer Lab. Checking out materials at Reserve. All of the above.