Blackburn, MichaelMandell, Arnold2018-02-142018-02-141980-11-14http://hdl.handle.net/2152.3/5726This image reflects a letter written by Michael Blackburn and Arnold Mandell to Jack Hammond of Del Mar Avionics regarding Heart Rate Variance.Jack HammondDel Mar AvionicsBruce Del MarWilliam ThorntonMichael BlackburnArnold MandellelectrocardioscannerelectrocardiocorderJohn WallaceSpace MedicineUTMBBlood Pressure MonitorAmbulatoryHeart Rate Variance