Article Jean-Marie Malherbe (2023)
130 years of spectroheliograms at Paris-Meudon observatories (1893–2023). Journal for the History of Astronomy (pp. 274-315). (/isis/citation/CBB478845963/) unapi

Article Wang, Da-ming; Gao, Wen-jie (2008)
George Ellery Hale, Father of Astrophysics and Pioneer of Big Science. Journal of Dialectics of Nature (pp. 79-87). (/isis/citation/CBB000952295/) unapi

Article DeVorkin, David H. (2000)
Quantum Physics and the Stars (V): Physicists at Mount Wilson Prior to 1922. Journal for the History of Astronomy (p. 301). (/isis/citation/CBB000671369/) unapi

Article Sheehan, William; Osterbrock, Donald E. (2000)
Hale's “Little Elf”: The Mental Breakdowns of George Ellery Hale. Journal for the History of Astronomy (p. 93). (/isis/citation/CBB000671359/) unapi

Article Osterbrock, Donald E. (1995)
Founded in 1895 by George E. Hale and James E. Keeler: The Astrophysical Journal centennial. Astrophysical Journal (pp. 1-7). (/isis/citation/CBB000031666/) unapi

Book Osterbrock, Donald E. (1993)
Pauper and prince: Ritchey, Hale, and big American telescopes. (/isis/citation/CBB000066499/) unapi

Article Osterbrock, Donald E. (1986)
Failure and success: Two early experiments with concave gratings in stellar spectroscopy. Journal for the History of Astronomy (pp. 119-129). (/isis/citation/CBB000050930/) unapi

Article Reingold, Nathan (1977)
The case of the disappearing laboratory. American Quarterly (pp. 79-101). (/isis/citation/CBB000000831/) unapi