Academic Libraries that use the Library of Congress Classification Outline (the majority of them) can easily be browsed for serendipitous discovery of wonderful books in your subject area. All you need to know is the call number range to get yourself situated.
Here are the general call numbers for the topic of Theatre.
Library of Congress Call Number Areas:
Plays, scenarios, etc.
Dramatic representation. The theater
Art of acting
The stage and accessories
Special regions or countries
The Jewish theater
College and school theatricals
Tableaux, pageants, "Happenings," etc.
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