The collection consists of the correspondence files of Frederick Hanley Seares. While roughly one half of the papers deal with administrative matters of the Mount Wilson Observatory, the remainder cover his scientific work. There are also some manuscripts, notes and notebooks (Boxes 19-21) related to Seares's research activities.
{Corresp: Harlow Shapley; A. Fowler; J. A. Parkhurst; H. H. Turner; J. G. Hagen; H. Spencer-Jones; J. Baillaud; A. S. Eddington; R. A. Sampson; J. Halm; J. Stebbins; W. W. Campbell. folded}
{Corresp: A. Fowler; H. Spencer-Jones; Henrietta S. Leavitt; Harlow Shapley; R. A. Sampson; Joel Stebbins; W. W. Campbell; Frank Dyson; J. A. Parkhurst; J. Baillaud; P. J. Melotte; H. H. Turner. folded, oversize}
{Corresp: A. Fowler; P. J. van Rhijn; R. A. Sampson; W. Dziewulski; J. G. Hagen; Robert H. Baker; Joel Stebbins; Harlow Shapley; Ejnar Hertzsprung; H. Spencer-Jones; J. A. Parkhurst. One thick item with 3 staples. folded}
{Corresp: F. J. M. Stratton; P. J. van Rhijn; A. Bemporad; R. A. SAmpson; P. J. Melotte; H. L. Vanderlinden; Bertil Lindblad; H. Plaskett; Östen Bergstrand; W. M. H. Greaves; Raymond S. Dugan; Harlow Shapley; Charles Fabry; Cecilia H. Payne; W. Hassenstein; J. Hellerich; K. Graff; Ejnar Hertzsprung; H. Spencer-Jones; A. Pannekoek; H. von Zeipel; K. G. Malmquist; W. K. Green; Gilbert Rougier. folded}
