Percival Lowell

Black and white drawing of Mars by Percival Lowell, 1901

Color drawing of Mars by Percival Lowell, 1905

Constance Lowell at Percival Lowell's Mausoleum

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

Harold and Stanley Sykes in Percival Lowell's 1911 Stevens-Duryea Automobile

Lowell Observatory Staff Seated at 24-inch Telescope, 1905: Harry Hussey, Wrexie Leonard, Vesto M. Slipher, Percival Lowell, Carl Lampland, John C. Duncan

Percival Lowell Looking at Negatives on the Porch of the Baronial Mansion, August 15, 1905

Percival Lowell Observing Venus During the Daytime

Percival Lowell and G. R. Agassiz at Lake Mary Picnic, June 1907

Percival Lowell and Guests at Picnic Near Baronial Mansion

Percival Lowell and the Three Head Members of the First Korean Diplomatic Delegation to the United States, 1883

Percival Lowell as Santa Claus on Roof of Old Library, 1911

Percival Lowell as a Young Man with Members of Korean Diplomatic Delegation, 1883

Percival Lowell at His Rental Home on Leroux Street in Flagstaff

Percival Lowell at Podium

Percival Lowell at the 24-inch Clark Telescope

Percival Lowell digging in his garden

Percival Lowell in His Library

Percival Lowell with Judge & Mrs. Doe at Deer Camp, Inner Basin, September 1907

Percival Lowell's Mausoleum

Percival Lowell's Mausoleum

Percival Lowell, G. R. Agassiz and Two Unidentified People at a Picnic in Northern Arizona

Studio Portait of Percival Lowell on Ornate Chair, 1904

Letter from Elizabeth Williams to Percival Lowell discussing Planet X calculations

Letter from Percival Lowell in Boston to A.E. Douglas in Flagstaff

Letter from Percival Lowell to A. E. Douglass on Selection of Flagstaff as Site for an Observatory, April 10, 1894

Percival Lowell's Trans-Neptunian Planet (Planet X) computations

Percival Lowell's trans-Neptunian planet (Planet X) computations

Deed Issued to Percival Lowell for Property to Build an Observatory in Flagstaff

First Observation Notes of Mars by Percival Lowell in 1894

Telegram from A. E. Douglass to Percival Lowell Telling of Ground Being Broken for Observatory, April 23, 1894

Telegram from Percival Lowell to A. E. Douglass Regarding Telescope Dome Preparations, April 16, 1894

The Coconino Sun, 1921-11-04

The Holbrook News, 1916-11-17

Arizona Highways, 1994-05

Discovering Pluto

Elizabeth Langdon Williams