Manual of second and third order triangulation and traverse. 

 - Washington :  Dep.of Commerce,  1946. 
 - 226 p. :  il. ;  23 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Metodología<br/>Triangulación
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>526.3