Article G. Wesley Lockwood; William Sheehan (2023)
The Solar Variations Project at Lowell Observatory. II: A 63-Year Quest to Measure the Sun’s Variability, and What Was Discovered Instead. Journal of Astronomical History and Heritage (pp. 769-815). (/isis/citation/CBB410445049/) unapi

Article William Sheehan (2019)
Treading carefully: V.M. Slipher, C.O. Lampland, E.C. Slipher and their ambivalent relationship with Percival Lowell's Mars. Journal of Astronomical History and Heritage (pp. 365-400). (/isis/citation/CBB025175687/) unapi

Article Tenn, Joseph S. (2007)
Lowell Observatory Enters the Twentieth Century---in the 1950s. Journal of Astronomical History and Heritage (p. 65). (/isis/citation/CBB000831607/) unapi

Book Putnam, William Lowell (1994)
The explorers of Mars Hill: A centennial history of Lowell Observatory, 1894-1994, [by] Putnam, William Lowell and others. (/isis/citation/CBB000033814/) unapi

Article Strauss, David (1994)
Percival Lowell, W.H. Pickering and the founding of the Lowell Observatory. Annals of Science: The History of Science and Technology (pp. 37-58). (/isis/citation/CBB000040457/) unapi