Clifford Stone claims to have catalogued fifty-seven species of extraterrestrials, many of which are humanoid and could walk among humans unnoticed.

Authors

• Person: Not available Organization: History News Network
  How the Pentagon Started Taking U.F.O.s Seriously
• Person: Not available Organization: The New Yorker
  How the Pentagon Started Taking U.F.O.s Seriously | The New Yorker

Sources

• How the Pentagon Started Taking U.F.O.s Seriously www.historynewsnetwork.org History News Network via serper
• How the Pentagon Started Taking U.F.O.s Seriously | The New Yorker www.newyorker.com The New Yorker via serper

Referenced by nodes (1)

• extraterrestrial concept