00667nam a2200217 a 4500 BRCA_6960 20190320205647.0 181111s1951----u--a######---#000-0#eng-# eng u RF300 .C66 1951 Corliss, Edith L. R. 17347 Selection of hearing aids Edith L. R. Corliss. Washington, D. C. United States Department of Commerce, National Bureau of Standards 1951 iv, 17 p. il. 23 cm. E. U. National Bureau of Standards circular 516 17348 O198 Aparatos para la sordera 17349 GFM lcc B 6642 6642 0 0 0 0 BRCA BRCA 2011-11-18 O198 0 RF300 .C66 1951 (O198) 7407 2019-03-22 00:00:00 2019-03-22 B