The library QuickSearch includes links to the individual plays in most of these collections, so if you are looking for a specific play, search there first. See the Plays and Monologues tab on the left for some strategies to browse playscripts in the UNLV Libraries book stacks.
Newspaper databases are a great resource for finding reviews of specific performances. Consider including the following: work title; playwright or performer; critic's name. Also, use quotation marks to keep titles and names together.
Print collections of theatre criticism