{S. I. Bailey; M. J. Balcello; Robert S. Ball; Carl Barus; Louis Agricola Bauer; A. Belopolsky; A. Bemporad; Pietro Blaserna; Henry Bourget; H. R. Boynton; H. Buisson; J. J. Byrne}
{C. O. Lampland; E. Percival Lewis; Frank B. Littell; Percival Lowell; H. G. Lyons; Maryland [Hotel]; E. Miller; G. Millochau; A. A. Nijland; Johann Palisa; Louis A. Parsons; J. E. Petavel; E. C. Pickering [incl c.2 ltrs S. W. Manning Fletcher ? S. I. Bailey; c.ltrs ECP ?? P. Lowell]}
{J. S. Plaskett; E. Pringsheim; Hugh B. Rice, Co.; A. Lawrence Rotch; C. Runge; J. R. Rydberg; Fernando Sanford; J. A. B. Scherer; Arthur Schuster [incl ltr Mrs. Schuster ? FHS]}
{T. C. Chambelin; C. A. Chant; G. A. Clark; W. W. Coblentz; A. Cotton; R. T. Crawford; Henry Crew; J. Danne; Arthur L. Day; H. Deslandres; A. Donner; F. W. Dyson; H. Ebert; Mrs. W. P. Fleming; E. Gehrcke; H. M. Goodwin; D. Goldhammer}
{Karl Schwarzschild; Arthur Searle; Frederick Slocum; Southern California Academy of Sciences [Holdridge O. Collins]; Ormond Stone; Tiffany & Co.; University Club of Pasadena [R. I. Howe; Esward L. Mayberry]; Felipe Valle; J. Violle; E. Warburg; A. B. Wills; A. Wolfer; E. Wiedemann}
{William Hallock; B. Harkányi; M. Harny; Karl Haussmann; Arthur R. Hinks; W. P. Hoge; Eliza P. Houghton; W. J. Humphreys; R. J. A. Innes; David Starr Jordan; Edward Bell Knobel; Otto Knopf; Friedrich Küstner}
{Concerns meeting of American section of proposed IAU in March 1919 & preparations for Brussels meeting of proposed IAU on July 18, 1919. Corresp: Joel Stebbins; S. I. Bailey; F. C. Jordan; J. A. Parkhurst; W. W. Campbell}
