{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}
{Herbert Dingle [lecture & notes by FHS on "Science and the Unobservable"]; Harold B. Dirks; Roberta Lloyd [Mrs. Hugh T.] Dobbins [re S. Pike's grave]; Dorpat University Meteorological Observatory; E. Doublet; John C. Duncan; R. S. Dugan; Theodore Dunham, Jr.; Theodore Dufur; O. L. Dustheimer}
{Aug. Collard; T. Collodi; F. Barrows Colton; Commission for Russian Scientists; A. Pribar de Conill; Duvall Cooper; Copernicus 450th Anniversary; Corning Glass Works; A. L. Cortie, S.J.; Robert Coughran; G. Cramer Dry Plate Co.; R. T. Crawford; Henry Crew; Raymond E. Crowtherb [Kodak, London]; James Cuffey}
Ren J Bache (3); Lloyd C. Bagby (4); Baker & Co., Inc. (3); George Banta Publishing Co. (1); Edward Emerson Barnard (1); Storrs Barrows Barrett (7); Bausch & Lomb Optical Co. (10); James G. Biddle (17); Paul Biefeld (4); Herbert Brownell (2); S. M. Brownell (1); Bertram Borden Boltwood (1); John A. Brashear & Co. [see J. B. McDowell Co.]; The Braun Corporation (1)
{Charlotte Bushnell Abbott; Julia Andrews; Dorothy Bach; Ruth E. Barnett; Della L. Bens; Mrs. Betty Trier Berry; Ronnie Best; Dorothy W. Block; Martha C. Borton; Anita Brown; Inez Mitchell [Mrs. S. M.] Brown; Keith Brown; Carolyn D. Burns [see also folder 48, A. J. CANNON]; Helen O. Burns}
{Ibérica; Indian Academy of Sciences [M. N. Saha]; Institut d'Astronomique Pratique, Warsaw, Poland; Institut d'Optique; Institut de Physique du Globe, Paris [Ch. Maurain]; Institute of International Education; International Catalogue of Scientific Literature; International Education Board [re grant for AAVSO]; International Magazine Co.; International Press Service; Irving-Pitt Manufacturing Co.; Dorothea Isaac-Roberts}
