Books like Powers That Be
Anne McCaffrey, Elizabeth Ann Scarborough
Powers That Be is 349 pages, about 6 hours 24 minutes at 250 words a minute.
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Dawn 4.7 h 
Brave New World and Brave New World Revisited 6.2 h 
The Year of the Flood 8.2 h 
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Leviathan 8.1 h 
Introduction to Genetic Analysis 15.3 h Bar height shows length. Estimated at 250 words a minute.