Proceedings of the Symposium on the Astronomy and Physics of Meteors, Held at Smithsonian Astrophysical Observatory Cambridge, Massachusetts, August 28-September 1, 1961DOI: info:10.5479/si.00810231.7Smithsonian Institution1–314
Whipple, Fred L. 1963. Proceedings of the Symposium on the Astronomy and Physics of Meteors, Held at Smithsonian Astrophysical Observatory Cambridge, Massachusetts, August 28-September 1, 1961, Whipple, Fred L., editor. Washington D.C.: Smithsonian Institution. In Smithsonian Contributions to Astrophysics, 7. https://doi.org/10.5479/si.00810231.7.