89. Uncertainties in the Far Infrared Absorption of Interstellar Clouds, Martin Harwit, Ap. J. Lett., 199, L398, (1975).

89. Uncertainties in the Far Infrared Absorption of Interstellar Clouds, Martin Harwit, Ap. J. Lett., 199, L398, (1975)., Box: 21, Folder: 33. Martin Harwit papers, 14-7-2402. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/174440 Accessed January 30, 2026.