Facts about hearing and hearing aids.
Series: NBS Consumer Information series ;; 4
Publisher: National Bureau of standards]; for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1971
Place of publication: [Washington
Language: eng
Number of pages: 31
Subjects: Deafness; Hearing aids
Notes: Bibliography: p. [32]
"A United States Department of Commerce publication."
"A consumers guide from the National Bureau of Standards."