W. G. Chaloner, 1995. "Marie Stopes (1880–1958): The American connection", Historical Perspective of Early Twentieth Century Carboniferous Paleobotany in North America, Paul C. Lyons, Elsie Darrah Morey, Robert H. Wagner
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Marie Charlotte Carmichael Stopes was one of the most remarkable women of the twentieth century. She will be remembered more for her work in pioneering the defense of women’s rights and birth control than for her contributions to paleobotany. Three aspects of her research on fossil plants are relevant to the development of that subject in North America; her revision of the Carboniferous “Fern Ledges” flora of New Brunswick, Canada; her work on the origin of coal balls; and her studies on coal petrology.