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Sadie Tanner Mosell Alexander, a lawyer and civil rights advocate who achieved many firsts as a black woman, died of pneumonia Wednesday at age 91 in Philadelphia. Alexander was the first black woman to earn a doctorate at the University of Pennsylvania - and the first nationwide to earn a doctorate in economics. She was the first black woman to graduate from Penn's Law School, and then the first admitted to legal practice in Pennsylvania. Throughout the 1930s, Mrs. Alexander and her husband, Raymond Pace Alexander, initiated legal fights that began to open up restaurants, hotels and movie theaters to blacks in Philadelphia.