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Samuel Pierpont Langley, secretary of the Smithsonian Institution, 1887-1906 : memorial meeting, December 3, 1906 : addresses
- "Samuel Pierpont Langley, secretary of the Smithsonian Institution, 1887-1906, memorial meeting, December 3, 1906. Addresses by Dr. White, Prof. Pickering and Mr. Chanute"
- "Samuel Pierpont Langley, secretary of the Smithsonian Institution, 1887-1906 : memorial meeting, December 3, 1906 : addresses"@en