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Harry Stephen Ladd Papers

Creator::
Ladd, Harry Stephen, 1899-  Search this
Extent:
2.58 cu. ft. (2 record storage boxes) (1 tall document box)
Type:
Collection descriptions
Archival materials
Diaries
Field notes
Scrapbooks
Black-and-white photographs
Date:
circa 1915-1982 and undated
Descriptive Entry:
These papers document Ladd's career with the USGS and his research on the geology of Pacific Islands. They include incoming and outgoing correspondence documenting field work, USGS matters, research and the publication of papers, and professional activities; diaries and field notes, mostly documenting his investigations in the Pacific; scrapbooks documenting personal and professional affairs, but which are particularly strong in documenting his role in the Crossroads Operation and Project Mohole; photographs, slides, and motion pictures, mostly from his field work in the Pacific; an oral history interview of Ladd conducted in 1977; and various manuscripts, notes, and lists from his research.
Historical Note:
Harry Stephen Ladd (1899-1982) received his Ph.D. in geology from the University of Iowa in 1925. The initial part of his professional career was spent in faculty positions at his alma mater and the University of Virginia, as a geologist with the Gulf Oil Company in Venezuela, and studying fossils under Edward Oscar Ulrich at the United States National Museum. Ladd began his career with the United States Department of Interior in 1936 when he was appointed Geologist with the National Park Service. In 1940, he joined the United States Geological Survey (USGS) as a Geologist. He remained with the USGS until his retirement in 1969. Ladd was a Research Associate in the Department of Paleobiology, National Museum of Natural History from 1969 until his death.

Ladd was an authority on the geology of the islands of the Pacific Ocean. He conducted extensive field work in the Pacific Basin and supervised deep sea drilling on Eniwetok, Midway and other atolls. He was also a major contributor to Project Mohole, a plan for drilling deep into the earth's inner crust on the Pacific Ocean floor near Hawaii. During 1946-1947, Ladd was in charge of geological work on Crossroads Operation which conducted the scientific survey and resurvey of Bikini Atoll, the site of atomic bomb tests. Ladd was active professionally and was a vice president of the Geological Society of America, 1955, and the American Association for the Advancement of Science, 1965, and President of the Paleontological Society, 1954.
Topic:
Operation Crossroads, 1946  Search this
Geology  Search this
Paleontology  Search this
Paleontologists  Search this
Geologists  Search this
Genre/Form:
Diaries
Field notes
Scrapbooks
Black-and-white photographs
Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
Identifier:
Record Unit 7396
See more items in:
Harry Stephen Ladd Papers
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_collection:sova-sia-faru7396

Box 1

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e250

Personal (2 folders)

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e258

Correspondence, c. 1925-1982 (2 folders)

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e270

Correspondence, 1924-1966

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e282

Personal

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e294

Correspondence, 1925-1973

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e307

Early Geological History of Eua, Tonga by H. S. Ladd and Frank I. Coulson

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e319

Correspondence, 1946-1982

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e331

Correspondence, 1958-1972

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e343

Eua, Tonga Correspondence on Minor Contributions

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e355

Correspondence and Photographs, 1968-1982

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e376

Correspondence, c. 1978-1980, includes photographs (2 folders)

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e389

Correspondence, c. 1979-1980

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e401

Correspondence, 1980

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e413

Chronological Correspondence, 1973-1974

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e425

Chronological Correspondence, 1975-1976

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e437

Chronological Correspondence, 1977-1979

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 1 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 1
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e449

Box 2

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e462

Oral History Interview with H. S. Ladd conducted by Clifford M. Nelson, 1977 (transcript)

Collection Creator::
Ladd, Harry Stephen, 1899-  Search this
Container:
Box 2 of 3
Type:
Archival materials
Collection Citation:
Smithsonian Institution Archives, Record Unit 7396, Harry Stephen Ladd Papers
See more items in:
Harry Stephen Ladd Papers
Harry Stephen Ladd Papers / Box 2
Archival Repository:
Smithsonian Institution Archives
EDAN-URL:
ead_component:sova-sia-faru7396-refidd1e470

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