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air cleaner gausze alternative stroking test apparatus baldwin-effect (sirnpson 1953) cerebral pneumography East Indian geranium oil ecolinguistic epidemiology of prematurity Ethel R. favorable terms flies in the ointment margin of optic cup Murdannia divergens oil immersed water cooling Orasthin potassium cyanides standard counter surging tank tannoy vapo(u)r velocity wave theory of light