The Guardian: How to Stage a Revolution
https://www.theguardian.com/music/2006/jan/06/classicalmusicandopera
This article from The Guardian discusses how Beaumarchais shaped 18th century history, not just through the social commentary in his plays, but in the activities of his life.
Internet Archive: The Classical Dictionary of the Vulgar Tongue
https://archive.org/details/aclassicaldicti01grosgoog/page/n6/mode/2up
This e-book version of The Classical Dictionary of the Vulgar Tongue by Francis Grose is both amusing and useful for understanding the slang and jokes in Holcroft's translation that would have been obvious to 18th-century audiences, but elude the modern-day reader.
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