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Samuel Pierpont Langley, secretary of the Smithsonian Institution, 1887-1906. Memorial meeting, December 3, 1906
- "Samuel Pierpont Langley, Secretary of the Smithsonian Institution, 1887-1906 : Memorial meeting, December 3, 1906"
- "Samuel Pierpont Langley, Secretary of the Smithsonian Institution, 1887-1906 Memorial meeting, December 3, 1906"
- "Samuel Pierpont Langley : Secretary of the Smithsonian Institution, 1887-1906 : memorial meeting, December 3, 1906"
- "Samuel Pierpont Langley, secretary of the Smithsonian Institution, 1887-1906. Memorial meeting, December 3, 1906"@en