From Nancy C. Russell, May 29, 1929, she talks about the upcoming book, "Good Medicine", suggests that Sack might be itnerested in some fighting pictures, she suggests "The War Scars of Medicine Whip".
Sack, George. Letter from Nancy C. Russell to George Sack. TU2009.39.2851.1-2. Charles M. Russell Research Collection (Britzman). May 29, 1929. Tulsa: Gilcrease Museum, https://collections.gilcrease.org/object/tu20093928511-2 (08/17/2016).
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