Hartman, W. J. <br/><br/>
Objective measurement of voice channel intelligibility / 
W. J. Hartman [and] K. J. Gamauf 
 - Washington, D.C. :  U.S. Government Printing Office,  1977 
 - v, 69 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Transportation--United States
<br/><br/><label>Dewey Class. No.: </label>388.0973