00306nam a2200097Ia 4500008004100000082001800041100003600059245006900095264003600164300000800200200527s9999||||xx |||||||||||||| ||und||  a371.912 HUR C  aHurvitz, Joel , Carmen, Richard 0aSpecial Devices for Hard of Hearing, Deaf and Deaf Blind Persons  bLittle, Brown and Companyc1981  a297