Website: J. Allen
Hynek Center for UFO Studies (CUFOS.org):
(Search term: “Hermann Oberth”)
Website: National Investigations Committee on Aerial Phenomena
(NICAP.org):
Website: Archives For the Unexplained (AFU.se), Norrköping, Sweden :
Wikipedia article: “Hermann Oberth”:
Related posts:
Professor
Hermann Julius Oberth,
German
Physicist & Engineer
(wikimedia.org photo)