Copies of plays are located in several libraries on campus. For browsing, a good starting place is the Arts Library Selected Plays & Monologues collection, located near the Reference shelves on the entry level. This collection is focused on acting editions, monologue anthologies, and dialect CDs, which can be borrowed for two weeks. Other locations for plays include Young Research Library and Powell Library.
Many plays, particularly acting editions, do not have specific subject headings, making it difficult to find a work by topic directly in the catalog. Collected anthologies usually do have headings (i.e. "African American women--drama), especially when they have a thematic focus. When searching for a specific play in the Library Catalog, try an "Author and Title List" search. This will help avoid getting false hits for criticism or unrelated works.
There is no specific subject heading for scene books, but scenes are frequently included in monologue anthologies. For browsing available monologue books, do a "Subject List" search in the catalog for "Monologues." A Keyword search for "scenes and monologues" will usually yield some books that also contain scenes.