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APASmart Define. (1970). Igor Ivanovich Sikorsky Human Powered Helicopter Competition thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/igor_ivanovich_sikorsky_human_powered_helicopter_competition/thesaurus/broader
ChicagoSmart Define. 1970. "Igor Ivanovich Sikorsky Human Powered Helicopter Competition thesaurus" https://smartdefine.org/igor_ivanovich_sikorsky_human_powered_helicopter_competition/thesaurus/broader (accessed September 29, 2026).
HarvardSmart Define 1970, Igor Ivanovich Sikorsky Human Powered Helicopter Competition thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/igor_ivanovich_sikorsky_human_powered_helicopter_competition/thesaurus/broader>.
MLASmart Define. "Igor Ivanovich Sikorsky Human Powered Helicopter Competition thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/igor_ivanovich_sikorsky_human_powered_helicopter_competition/thesaurus/broader>