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Elizabeth Williams, who worked as a computer for Lowell Observatory beginning in 1905.

Letter from Elizabeth Williams to Percival Lowell discussing mathematical calculations of Planet X and Uranus. Williams worked in Lowell's Boston office for many years as a computer, making calculations associated with Lowell's search for Planet X.

Trans-Neptunian planet (Planet X) computations by Elizabeth Williams, who worked in Percival Lowell's Boston office as a computer, i.e. a person who manually made calculations.

This scrapbook contains newspaper clippings, cartoons, illustrations, and a few photographs.

This scrapbook contains birth, death, and marriage announcements.

This scrapbook contains handwritten accounts and mementos from Leonard's personal life.

Logbook page with drawings of Venus by Wrexie Leonard and Percival Lowell

Drawings of Mars by Wrexie Leonard, Percival Lowell, and T.J.J. See

Drawings of Mars by Wrexie Leonard and Percival Lowell

Drawings of Mars by Wrexie Leonard and Percival Lowell