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56. Submillimetre Observations of the Night Sky Emission Above 120 Kilometres, Judith L. Pipher, J. R. Houck, Barrie W. Jones and Martin Harwit, Nature, 231, 375, (1971)., Box: 21, Folder: 31. Martin Harwit papers, 14-7-2402. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/174407 Accessed January 24, 2026.