Higgins, A.L. <br/><br/>
Elementary surveying 

 - Third 
 - Longman group ltd.  America  1970 
 - 190  fig. 
<br/><br/><label>Nat. Bib. No.: </label>5329 
<br/><br/><label>Subjects--Index Terms: </label>Orientation Trapezoidal Elementary surveying 
<br/><br/><label>Universal Decimal Class. No.: </label>528..8  / ELF