Workshop reports :  numbers 1, 2 & 3 

 - [London ?] :  Hydrographic Society,  [1978 ?] 
 - 24 p. 
 - Special publication ;   no. 6 .
<br/><br/> Cover title 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrographic surveying