United States. Senate <br/><br/>
Investigation of Western Union and Postal Telegraph-Cable Companies 

 - Washington :   Government Printing Office,   1909. 
 - 554 p. ;   18 cm. 
 - Senate document ;   725 .
<br/><br/> Letter from the Secretary of the Department of Commerce and Labor, Transmitting pursuant to a Senate Resolution of May 28, 1908, a Partial report Showing the Results of an Investigation Made by the Bureau of Labor into The Western union and the Postal telegrph-Cable Companies