The Fifty-seventh Meeting of the AAS was held at Hood College, Frederick, Maryland, from Monday to Wednesday, December 28–30, 1936 at the invitation of Leah B. Allen, Professor of Astronomy. "Archived copy". 13 Mayıs 2008 tarihinde kaynağından arşivlendi. Erişim tarihi: 26 Haziran 2009.
The Fifty-seventh Meeting of the AAS was held at Hood College, Frederick, Maryland, from Monday to Wednesday, December 28–30, 1936 at the invitation of Leah B. Allen, Professor of Astronomy. "Archived copy". 13 Mayıs 2008 tarihinde kaynağından arşivlendi. Erişim tarihi: 26 Haziran 2009.