title: Speec in an artificial atmosphere (44 per cent oxygen-56 per cent helium). AMRL-TR-66-165.
mesh_terms: D000162:Acoustics; D018504:Ecological Systems, Closed; D006371:Helium; D006801:Humans; D008297:Male; D013026:Space Flight; D013060:Speech
chemical_list: D006371:Helium