Keywords: Maria Mitchell.jpg Maria Mitchell US astronomer and pioneer of women's rights from a portrait by H Dassell 1851 http //digital library upenn edu/women/wright/sweeper/sweeper html Sweeper in the Sky The Life of Maria Mitchell First Woman Astronomer in America by Helen Wright 1914-1997 New York The Macmillan Company 1949 Copyright was not renewed; therefore Sweeper in the Sky is in the public domain in the United States However please note that the copyright status of the Maria Mitchell portrait is NOT determined by its publication in Sweeper in the Sky As an image of a two-dimensional work of art the work of art having been created in 1851 this is a public domain image according to Wikipedia's guidelines 1851 H Dassell PD-100 <gallery>File Maria Mitchell theb3534 jpg</gallery> Maria Mitchell Historical astronomical instruments |