2. Loyd S. Swenson, Jr., James M. Grimwood, and Charles C. Alexander, This New Ocean: A History of Project Mercury, NASA SP-4201.
3. The first volume of a projected multivolume chronology of Project Apollo is: Ivan D. Ertel and Mary Louise Morse, The Apollo Spaecraft: A Chronology, Vol. I: Through November 7, 1962.
4. Gemini Program Office issued 19 quarterly reports, the first covering the three months ending May 31, 1962; the last, the three months ending Nov. 30, 1966.
5. MSC Weekly Activity Report for the Office of the Director, Manned Space Flight; MSC Consolidated Activity Report for the Office of the Director, Manned Space Flight. Each report consisted of separate reports from major MSC elements, including Gemini Program Office.
6. These varied in format and usefulness. Of greatest value: Lockheed Missiles and Space Company, Gemini Agena Target Vehicle Program Progress Reports for the months September 1964 through November 1966 (LMSC-A605200-1 through -27); North American Aviation, Inc., Space and Information Systems Division, Contract NAS 9-167, Paraglider Development Program, Phase II, Part A, Monthly Progress Letters Nos. 1-16 for Nov. 20, 1962, through Mar. 31, 1963; idem., Contract NAS 9-539, Paraglider Development Program, Advanced Trainer and Prototype Wing Design, Phase II, Part B(1), Monthly Progress Letters Nos. 1-9 for June 20, 1962, through Mar. 31, 1963; idem., Contract NAS 9-1484, Paraglider Landing System Program, Monthly Progress Reports Nos. 1-21 for the months May 1963 through January 1965.
7. Notably Aerospace Report TOR-1001(2126-80)-3, Gemini Program Launch Systems Final Report: Gemini/Titan Launch Vehicle; Gemini/Agena Target Vehicle; Atlas SLV-3, January 1967; McDonnell Report F169, Gemini Final Summary Report, Feb. 20, 1967; North American Report SID 65-196, Final Report of Paraglider Research and Development Program, Contract NAS 9-1484, Feb. 19, 1965.
8. Lockheed, Gemini Agena Target Press Handbook (LMSC-A766871), Feb. 15, 1966; McDonnell External Relations Division, Gemini Press Reference Book, various ed.; Martin Company, Gemini-Titan II Air Force Launch Vehicle Press Handbook, Feb. 2, 1967. Each of these appeared in several editions, corresponding to changing vehicle configurations in different Gemini missions. The differences between the editions are minor.
9. Especially the MSC Fact Sheet 291 Gemini Program Series, one of which was issued for each manned Gemini mission. Author of the series was Ivan D. Ertel, MSC Assistant Historian. Another useful source was MSC Space News Roundup, an official biweekly publication of MSC.
10. Notably the series of annual chronologies compiled by the NASA Historical Office, with varying titles and dates of publication: Report of NASA to House Committee on Science and Astronautics, Aeronautical and Astronautical Events of 1961, 87th Cong., 2nd Sess., June 7, 1962; Report of NASA to House Committee on Science and Astronautics, Astronautical and Aeronautical Events of 1962, 88th Cong., 1st Sess., June 12, 1963; Astronautics and Aeronautics, 1963: Chronology on Science, Technology, and Policy, NASA SP-4004; same title, 1964, NASA SP-4005; same title, 1965, NASA SP-4006; same title, 1966, NASA SP-4007. One other chronology was of particular value: Howard T. Harris, Gemini Launch Vehicle Chronology, 1961-1966, AFSC Historical Publications Series 66-22-1, June 1966.
11. Eugene M. Emme, Grimwood, and William D. Putnam, "Historical Notes on Oral History in NASA," NASA Hqs. Historical Note 77, November 1967.
12. For example, memo, Chief, Technical Services Division, to Public Affairs Officer, subject: Comment Draft of "Project Gemini Operations: A Chronology," May 31, 1967; letter, B. A. Hohmann to Grimwood, Aug. 16, 1967, with enc., "Aerospace Critique, Project Gemini Technology and Operations: A Chronology"; letter, Gordon P. Cress and C. E. Heimstadt, Weber Aircraft, to MSC Historical Office, May 12, 1967.
13. We follow here the categorization suggested in NASA's Tenth Semiannual Report to Congress, July 1-December 31, 1963, p. 24; "The Gemini program can broadly be categorized by calendar years as follows: 1961 - feasibility; 1962 - design; 1963 - development; 1964 - production, test, initial flights; 1965 and 1966 - production and operational flight missions."
14. The second unmanned flight, although attempted in 1964 and conceptually belonging to the period covered in Part II, was not accomplished until 1965; it therfore appears in Part III.