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Anna Jespersen (December 14, 1895 - July 15, 1989) was an American geologist best known for her aeromagnetic surveying work. Anna Jespersen began her career as a teacher before commencing a 45-year scientific career spending the vast majority of her time working for the United States Geological Survey developing and publishing her work on aeromagnetic surveying. In her later years she moved on to work with Ghana and the United Nations. Her 45 year career in the geological field came to a close after she finished working with the Arctic Institute.