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Gus Grissom - Wikipedia
Virgil I. Grissom | Mercury, Gemini & Apollo | Britannica
Apollo 1 tragedy: The fatal fire and its aftermath
Former Astronaut Virgil I. Grissom - NASA
55 Years Ago: Tragedy on the Launch Pad - NASA
55 Years Ago: The Apollo 1 Fire and its Aftermath - NASA
Remembering NASA Astronaut Gus Grissom - ThoughtCo
How the Apollo 1 Mission Turned Deadly—Before Blastoff
Apollo 1 - National Air and Space Museum