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Mildred Butler Engdahl, who published under her maiden name Mildred Allen Butler, was the mother of writer Sylvia Engdahl. She had a B.A. from Wellesley College and an M.A. in Drama from the University of Oregon, and had worked both as a high school English teacher and as a director of community theaters. Late in her life she wrote several historical books for teens as well as articles for scholarly magazines. She died in 1987 at the age of ninety.