“H. L. Johnson, April 17, 1921 - April 2, 1980”., RMxAA, vol. 5, no. 1, p. 3, Jan. 1980, Accessed: Dec. 11, 2025. [Online]. Available: https://astronomia.unam.mx/journals/rmxaa/article/view/1980rmxaa...5....3m