{A. O. Tait; Tashkent Astronomical Observatory; A. Tass; Taylor and Francis; Taylor Instrument Cos.; Taylor, Taylor, & Hobson, Ltd.; Robert J. Teall; Jan Teders; B. G. Teubner; A. David Thackeray; O. Thomas; W. Irwin Thompson; --Thorndike; E. R. Thorwarth}
{J. O. Backlund; Solon Irving Bailey; L. D. Bailiff; Baker & Taylor Co.; Bakersfield Californian; E. F. van de Sande Bakhuyzen; Ruth S. Bakker; A. C. Balch; Ralph R. Baldwin; P. Barrachi; Martha Barnum; John Barrett; Albert Lloyd Barrows}
{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.}
{G. B. Lal; Lancaster Press, Inc. [O. J. Smith, Jr.]; Hugo Landi; R. J. Lang; Sir Joseph Larmor; Jennie B. Lasby; Latvia University Astronomical Observatory, Riga [S. Slaucitajs]; G. Lecointe; H. Lehmann; Lemcke & Buechner; George H. Lepper; Sophia H. Levy; Lick Observatory; Bernhard Liebisch}
{Nikolayev Astronomical Observatory [L. Semenov]; Nixdorf Observatory; Charles A. Noble; Gladys Noon; H. Nort; Norwegian Meteorological Institute [folded]; Werner Nowachi; Arthur A. Noyes}
{Leo J. Scanlon; William C. Scarritt; Robert O. Schad; Paul W. Schenck; James A. B. Scherer; Frank H. Schleer; Carl Schleicher & Schüll; Hans W. Schneider; Dorothy E. Schoof; J. Schroeter; F. Schuerer; L. Schützenberger; A. Schwassmann}
{--Kammerlingh-Onnes; "Kapteyn Cottage"; B. Karpov; Katherine P. Kaster; Kasan University Astronomical Observatory; Katherine P. [Mrs. H. B.] Kaster; J. Kater; Heinrich Kayser; C. H. Kelley; Hugh J. Kelly; Roy J. Kennedy; Norton A. Kent; Frederick P. Keppel; M. de Kerolyr; Keystone View Co. of New York, Inc. [F. Lorenz]}
