Gertrude Ruhnka (1891-1981) was a research librarian at the Huntington Library in California. The collection contains her unpublished manuscript, "Love for life: a self-portrait of the first three generations of du Ponts in America, 1791-1834," and two letters from Ruhnka to J.B. Lippincott Company and Dr. Walter J. Heacock of the Eleutherian Mills-Hagley Foundation.