Lowell Observatory

August 23

First Measurement Instruments at Site of Lowell Observatory, Flagstaff, Arizona

Flagstaff, Ariz. Lowell Observatory

G.A. Waterbury and A.E. Douglass and the Lowell Observatory, 1898

Lowell Observatory in Flagstaff

Lowell Observatory in Flagstaff

Andrew Ellicott Douglass

Clyde Tombaugh

Elizabeth Langdon Williams

Percival Lowell

Flagstaff It Is- The Founding of Lowell Observatory

Selections from the Lowell Observatory Archives

Year of Pluto

Arizona Weekly Citizen, 1894-07-07

The Coconino Sun, 1911-01-06

Arizona Highways, 1994-05

Discovering Pluto

Flagstaff