Hallowell Davis, Stanley Smith Stevens & Randolph Henry Nichols, Jr.
Hearing aids: an experimental study of design objectives.
R591125. Hearing aids: an experimental study of design objectives. By Hallowell Davis, Stanley Smith Stevens & Randolph Henry Nichols, Jr. © 14Aug47; AA60681. The President and Fellows of Harvard College (PWH); 6Nov74; R591125.
The President and Fellows of Harvard College|PWH