{J. Jackson; Harold Jacoby; Hamilton M. Jeffers; Frank B. Jewett; N. Jewdokimow; Johns Hopkins Press/University; William Templeton Johnson; Robert Jonckheer; T. T. Jones Co.; Frederick C. Jordan; L. V. Julihn [incl ltr F. G. Cottrell ? FHS]; W. Junk, Publishers}
{R. A. Millikan; Monroe Calculating Machine Co. [folded. incl Calculator Equipment Corp.]; Montevideo, Observatory of the University of [folded]; Monthly Weather Review; Joseph Monti; K. Moór [?]; Ernest C. Moore; Morava Construction Co.; D. W. Morehouse [incl ltr H. Shapley ? DWM]; D. P. Moreton; G. W. Morey; --Moriceau; T. H. Morgan; Sylvanus G. Morley; W. D. Morrison; Albert G. Mowbray [incl memo EPH ? FHS]; F. R. Moulton; Z. Müller; Carlos S. Mundt}
{Karl Bohlin; N. Boneff; M. Thérèse Bonney; Andrew R. Boone; Henry Borsook; H. Bourget [incl ltr GEH ? HB]; Frederick Edward Brasch; Charles Breasted; Virginia Brenton [ltr Helen B. Pryor ? Monroe E. Deutsch; ltr FHS ? MED]; Alfred Brill; British Astronomical Association [W. Alfred Parr]; William Robert Brooks; W. Sterry Brown; Emile Bruguierel; Mrs. Roberdeau Buchanan; George J. Burns}
