Shirley Jones ("Madam Librarian") in THE MUSIC MAN.
 
What about the Thatcher Library in CITIZEN KANE (or was that
the Thatcher Mauseleum)?
 
How far does this theme extend?  Does a library scene qualify?
 
If so, there is a recent film (within the last few years) with
Cher and Dennis Quaid (she's a lawyer; he's a Washington
lobbiest).  They do research in a law library.
 
GHOST BUSTERS has a library scene.  ALL THE PRESIDENT'S MEN.
PAPER CHASE.
Doyle Burke
Mesa Community College (AZ)
Burke@MC