Scope and Contents: This series contains astronomical observations, data calculations, and research notes produced by astronomers at the Harvard College Observatory throughout the first half of the 20th century. Most of the materials date between 1900 and 1935.Astronomers whose work is represented in this series include: Williamina Fleming, Evelyn Leland, Solon Irving Bailey, Antonia Maury, Henrietta Swan Leavitt, Edward S. King, Sarah E. Breslin, Annie Jump Cannon, Boris Petrovich Gerasmovich, Leon...