Police communications in an urban county 

 - Washington, D.C. :  United States Government Printing Office,  1982 
 - Various pagings ;  30 cm. 
<br/><br/> Cover title 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Police functions<br/>Police services
<br/><br/><label>Dewey Class. No.: </label>363.2380