Finding a play that is published separately is easy--if the library owns it, a title or author search will lead you to it. Finding a play that is published in an anthology is not as simple. Sometimes you can find a play in a compilation by doing a title search, sometimes by doing a keyword search (in case the title is listed in a contents note), and sometimes by using Play Index to find out if the library owns the play you are looking for.
To find plays by call number range, see the box below this one.
To find a specific play:
Call numbers for plays are in the ranges below:
The 2s in bold indicate drama.
800 range Literature 5th floor
808.82 Play anthologies (theoretically from more than one original language but in practice may all have been written originally in English)
812 American drama (including time period breakdowns, like 812.6 (21st century))
812.08 American plays and short/one-act plays by many different authors
812.4 American drama in the 19th century
812.5 American drama in the 20th century
812.52 American drama by authors publishing for the first time in the first half of the 20th century
812.54 American drama by authors publishing for the first time in the second half of the 21st century
812.6 American drama in the 21st century
822 British drama (including time period breakdowns, like 822.914 (second half of 20th century) and 822.92 (21st century))
832 German drama (in German or translated from German into other languages) with time period breakdowns
842 French drama (in French or translated from French into other languages) with time period breakdowns
852 Italian drama (in Italian or translated from Italian into other languages) with time period breakdowns
862 Spanish drama (in Spanish or translated from Spanish into other languages) with time period breakdowns
8X2 other original languages (e.g., 882, classical Greek drama, in the original language or translated into English)
782.14 most librettos of musicals Presser Music Library
791.4372 screenplays 5th floor