Source: 
MS 2750/153/29
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copyright © 2020 by Penguin Random House LLC; from PENGUIN RANDOM HOUSE CORPORATE CORRESPONDENCE by Penguin Random House LLC. Used by permission of Alfred A. Knopf, an imprint of the Knopf Doubleday Publishing Group, a division of Penguin Random House LLC
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courtesy of Penguin Random House Archive and Library UK, held at the University of Reading Special Collections