Daily: 10 A.M.–5 P.M.
Closed on Tuesdays
1151 Oxford Road
San Marino, CA 91108
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Manuscripts
[W. S. Harmon Co. (1); Kenneth A. Harvey (2); The Haskin Service (4); Reed Leroy Hilton (2); Hayden Planetarium (Robert R. Coles) (3); Edwin B. Heaford (2); W. P. Heath, Jr. (5); Byron A. Hill (4); Henry Holt and Company, Inc., Publishers (2); James Dryden Hosken (3); Houghton Mifflin Company (1); William S. Huber (3); A. M. Hudson (2); Don Hughes (2); William W. Huse (1)]
mssHumason papers
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Manuscripts
George Ellery Hale (1); Asaph Hall, Jr. (5); William Edmund Harper (1); Harper's Magazine [includes correspondence with Ellsworth Huntington] (7); George Russell Harrison (2); Margaret Harwood (5); Russell M. Heath (1); S. G. Hefelbower (1); Henry Heil Chemical Co. (6); Adam Hilger, Ltd. (1); Herbert Percival Hollnagel (3); Herbert Clark Hoover (1); John M. Howie [includes copy letter EP 6 Victor Clifton Alderson] (3); Wilbur Franklin Hoyt [includes photo] (4)
mssPettit papers
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Manuscripts
[RPI Engineer (2); Theodore Morse Ritchie (2); Franklin E. Roach (2); L. Rosino (2); Bruce H. Rule (c.ltr BHR 6 Elmer Neimoeller, American Institute of Electrical Engineers) (1); A. W. Rundquist (2)]
mssHumason papers
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Manuscripts
[Wayne Harbour (2); Susan Harper (2); Albert J. Harrison (3); David Hart (2); Lud. Hebeier (3); Karl Herndon (1); Cedric E. Hesthal (2); Mrs. Daisy M. Hill (2); Amos H. Hoff (2); Gerald J. Holton (1); Lewis Howard (2); H. R. Howell (2); Walter J. Howell (2); Grace (Mrs. Edwin P.) Hubble (1); Charles Morse Huffer (2)]
mssHumason papers
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Manuscripts
Asaph Hall, Jr. (1); L. R. Hafstad (1); Herbert A. Hamm (1); Hanovia Chemical & Manufacturing Co. (23); R. I. Harris (1); Gilbert Havens (2); Earnest W. Hawkes (2); Fred H. Heath (1); Bernard Clifford Hendricks (1); Adam Hilger, Ltd. (1); Leonard Hill (2); Thorfin Rusten Hogness (3); Mrs. C. I. W. Hollister (2); William James Hooper (4); Frank E. Howard (4); William Franklin Hoyt (18); Blythe Hurst, Sr. (6)
mssPettit papers
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Manuscripts
[Eugene L. Hancock (1); Arthur T. Harvey (2); Arthur Holden (2); Robert E. Holzer (1); Roy M. Hubel (2)]
mssHumason papers