The Colregs guide 
Dokkum, Klaas. 
 -  Dokmar Maritime Publishers BV.,  2021 
 - 224 pages 
<br/><br/>
<br/><br/><label>ISBN: </label>978-9-07150054-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Navigation. -- Safety measures.
<br/><br/><label>Dewey Class. No.: </label>M 623.8884 D658 2021