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Martha Frick Sanger (née Symington; born 1941) is an American writer and the great-granddaughter of Henry Clay Frick.

External videos
Presentation by Sanger on Henry Clay Frick: An Intimate Portrait at the National Portrait Gallery, October 29, 1998, C-SPAN

• Helen Clay Frick: Bittersweet Heiress, biography (Pittsburgh: University of Pittsburgh Press, 2007)
• The Henry Clay Frick Houses: Architecture-Interiors-Landscapes In the Golden Era, nonfiction (New York: Monacelli Press, 2001)
• Henry Clay Frick: An Intimate Portrait, biography (New York: Abbeville Press, 1998)

• http://frickhistory.com/ Martha Frick Symington Sanger website

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