This dataset contains photos of selected documents from the Carl Sagan Collection that are discussed in the paper "Scientific Inquiry and the Stigma of UAP: Lessons from the Carl Sagan Collection," by Jacob Haqq-Misra in the journal Limina. All originals are stored in the Manuscript Division at the Library of Congress. All photos were taken by Jacob Haqq-Misra on October 19, 2019. Contents: Letter from Richard C. Henry responding to Frank J. Tipler’s article "Intelligent extraterrestrial beings do not exist" dated 3 November 1980 [3 pages, box 790, folder 7] Letter from Robert O. Dean (27 years military service) to Carl Sagan dated 3 January 1984 about taking the UFO problem seriously [2 pages, box 791, folder 6] Letter from Stanton T. Friedman to Carl Sagan dated 3 January 1987 about taking the UFO problem seriously [1 page, box 791, folder 8] Letter from Stanton T. Friedman to Carl Sagan dated 9 November 1988 again about taking the UFO problem seriously [3 pages, box 791, folder 10] Questions for Carl Sagan by Stanton T. Friedman dated 26 November 1992 [3 pages, box 792, folder 6] Paper/lecture by James E. McDonald on 12 March 1968 entitled "UFOs - An International Scientific Problem" [39 pages, box 792, folder 3] Summary of a talk by James E. McDonald to Boeing on 7 August 1968 entitled "UFO Investigations -- Past, Present and Future" [6 pages, box 790, folder 5] Newspaper clipping from the Ithaca Journal on 26 November 1977, entitled "Carter pushes UFO probe" [box 790, folder 4] Newspaper clipping from the Ithaca Journal on 1 November 1977, entitled "U.N. discusses UFOs and sees 'Encounters'" [box 790, folder 4]