00565cam a22001931  45000010008000000030004000080050017000120080041000290100017000700400018000870500015001050820015001201000026001352450096001612600039002573000031002965040026003276500018003533116883OSt20191024123136.0740410s1967    ilua     b    000 0 eng    a   67012046   aDLCcDLCdDLC00aRF300b.W300a617.89 WAL1 aWallenfels, Herman G.10aHearing aids on prescription,cby Herman G. Wallenfels. With an introd. by John A. T. Ross.  aSpringfield, Ill.,bThomasc[1967]  axv, 109 p.billus.c24 cm.  aBibliography: p. 109. 0aHearing aids.