- Manhigh I to 29,500 m (96,784 feet), by Captain Joseph W. Kittinger on June 2, 1957. The balloon was launched from South St. Paul Airport and was cut short due to an oxygen valve being installed backwards which vented the air supply outside. 
- Manhigh II to 30,942 m (101,516 feet), by Major David G. Simons on August 19–20, 1957 for a 32-hour flight
- Manhigh III to 29,900 m (98,097 feet), by Lieutenant Clifton M. McClure on October 8, 1958
With the pilot and the scientific payload, the Manhigh II gondola had a total mass of 748 kg (1,649 lb). At maximum altitude, the balloon expanded to a diameter of 60 m (200 ft) with a volume of over 85,000 m3 (111,000 cu yd).
A similar project in which a man in a gondola reached an altitude of 15,785 m (51,788 ft) was performed in 1931 by the Swiss physicist Auguste Piccard.
- American Experience: Space Men 2016 PBS
- Kane, item 1541, p. 47
- Clifton McClure; Rode Balloon to Edge of Space
- Kane, Joseph Nathan (1997), Famous First Facts: A Record of First Happenings, Discoveries, and Inventions in American History (Fifth Edition), The H.W. Wilson Company, ISBN 0-8242-0930-3
- Kennedy, Gregory P. (2007). Touching Space: The Story of Project Manhigh. Atglen, Pennsylvania: Schiffer Books. ISBN 978-0-7643-2788-9.
- Ryan, Craig (1995). The Pre-Astronauts: Manned Ballooning on the Threshold of Space. Naval Institute Press. ISBN 1-55750-732-5.
- Simons, David G.; Schanche, Don A. (1960). Manhigh. Avon Books.