{Herbert Meredith Reese; F. P. Reilly; M. dos Reis; W. Reiter; Remeis Observatory, Bamberg; Rennselaer Polytechnic Institute Library; Republic Productions, Inc. [John T. Bourke]; D. J. Rhederg; E. W. Rice; Hugh S. Rice; C. R. Richards; Harold Richards; L. J. Richardson; R. G. D. Richardson; K. M. Richey}
{E. H. Tipton; F. M. Tisdel; Richard C. Tolman; Treasury Department [C. W. Pendleton]; Triangle Photo Service [M. R. Rikon]; Karl J. Trübner; W. A. Trumbull; R. H. Tucker; Turkmenistan Observatory; Spencer D. Turner; Tuttle, Morehouse, and Taylor, Co.}
{F. G. Hagemann; H. M. Hall; J. Halm; Hamburg Seewarte; Richard Hamer; W. J. Hanna; E. Hartwig; Georg Hartwig; Harvard College Observatory; Herbert Harvey; Margaret Harwood; W. Hassenstein}
{Felix M. Perez [Sanchez]; T. P. Perkins; Nicolas Perrakis; C. D. Perrine; Max Petersen; John E. Pfeiffer; Philadelphia Inquirer [John Miller]; "Pinacyanol" [advert from Lucius & Brüning Farbwerke]; Harry Hemley Plaskett; Poggendorff's Biographisch-Literarisches Handwörterbuch; Popular Astronomy; Popular Science Monthly [Sumner Blossom]; M. A. Porcabeuf; J. G. Porter; Potsdam Astrophysical Observatory [H. von Klüber; E. F. Trondlich]; Poulkovo Observatory; N. R. Powley; Poznan Observatory [Joseph Witkowski]; Irwin G. Priest; Henry S. [& Mrs.] Pritchett; S. Procopin; W. S. Prosser; Herbert Putnam; G. P. Putnam's Sons; W. F. Quarrie & Co. [S. E. Farquhar]}
{C. Addison Willis; H. C. Willis; Carl Wilson; Herbert C. Wilson; H. W. Wilson Co.; Latimer J. Wilson; Olin C. Wilson; Ralph E. Wilson; Clyde Wolfe; Coral Wolfe; Harry O. Wood; R. W. Wood; R. v. d. R. Woolley; J. H. Worthington}
{Joseph A. Hodam; C. Hoffmeister; Helen Sawyer Hogg; Melvin J. Hoirch; Hong Kong Royal Observatory; Inga Howard; Herbert A. Howe; J. Huizinga; Beatrice M. Humason; W. J. Hussey; Robert Maynard Hutchins}
{C. Easton; J. M. Eder; Frank K. Edmondson; W. S. Eichelberger; Greta Ekelöf; Ferdinand Ellerman [ltrs re FE's death: George E. Johnson ? FHS; FHS ? GEJ]; C. T. Elvey; Pio Emanuelli; Encyclopaedia Britannica [W. L. Dalton]; S. Enebo; Wilhelm Engelman, Publisher; Eugene H. Eyster}
