Keyword searching can be very fruitful.
Search example: germany weimar twenties
Browsing the Library of Congress subject headings index can be more efficient.
Some useful headings begin with the following terms:
For works about specific plays and their adaptation or performance, start with the playwright's name and the title of the play as in this example:
List of Books your Instructor has placed for TFH101 on Print Reserve (2nd Floor of the Library, Circulation Desk)
Use to find brief background information.