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Abstract: Correspondence, writings, records of astronomical expeditions, diaries, notebooks and scrapbooks of David Peck Todd, astronomer and teacher at Amherst College from 1881 to 1917. Between 1882 and 1914 Todd conducted nine expeditions to various parts of the world to study solar eclipses. The notes, photographs, drawings and memorabilia of these expeditions make up a significant portion of the papers. He was also a fertile inventor, and plans and drawings for many devices, some related to...