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Tags: 15th century; 16th century; 17th century; 18th century; 19th century; 20th century; 21st century; books; District of Columbia; electricity; engineering; library; manuscripts; mathematics; museum; sciences; transportation; Washington

Tags: activist; african american; civil rights; civil war; nurse; suffragist; women

Tags: dignitary; women

Tags: dignitary; first lady; women

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Tags: landscape architect

Tags: dignitary; politician

Tags: president