{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}
[Grace Hawk; Walter S. Heller; Donald O. Hendrix; Joseph Q. Heplar; George H. Herbig; Paul Herget; Samuel Herrick, Jr.; Hilger & Watts, Ltd. {J. W. Perry}; Byron Hill; W. A. Hiltner {incl c.ltr BHRule to WAH; c.ltr WAH to BHRule}; Edison R. Hoge; A. R. Hogg; Leo Hollenberg; Alice W. Hood; Hubert V. Hopkins; Inga Howard; Edwin P. Hubble; Grace Hubble; Milton L. Humason; W. S. Huxford; J. A. Hynek]
{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}
[Byron Hill; Eugene Hlady {folded}; D. K. R. Hodgkin {re William Buscombe}; S. von Hoerner {incl ltr Elizabeth P. Lam to ISB; ltr ISB to EPLam}; Helen Sawyer Hogg {incl c.proposal from D. H. McNamara to NSF}; William V. Houston; C. J. van Houten; Fred Hoyle {c.ltr Robert F. Bacher to FH}; Fernando P. Huberman; Alice Hahn; H. C. van de Hulst; Milton L. Humason {folded}; J. C. Hunsaker; Rev. Earle L. Hutsell; Milton Hyman; J. Allen Hynek]
{W. H. Havens; Alan S. Hawksworth; E. R. Hedrick; Paul Helbronner; Rollin D. Hemans; St. Hempel; Abel Heywood and Son; "Herschel Portrait" [A. O. Leuschner; Louis J. Carmel]; Elsie Isabel Hill; F. W. Hinrichs, Jr.; Shiu Hirayama; E. Hirsch}
[Harold B. Hill; William A. Hiltner; Arthur A. Hoag; Paul Hodge; A. R. Hogg; David E. Hogg; Erik Holmberg; Dilys Holter; William E. Hough; Houghton Mifflin Co. {Sandra P. Hewlett}; Léo Houziaux; Robert F. Howard {re MNGnevyshev}; John R. Howe; Grace Hubble; Milton L. Humason; Charles L. Hyder]
