Rayner, William Horace  1884- <br/><br/>
Digital communications 
by Ian A. Glover and Peter M. Grant 
 - New York,  Van Nostrand-Reinhold  c[1969] 
 - x, 533 p.  illus.  22 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0442068549 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Surveying