About: http://webisa.webdatacommons.org/87187588

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	(1) if they are provided with steel hatch covers and effective means of closing all ventilators and other openings leading to the holds;
http://www.w3.org/ns/prov#wasQuotedFrom	refworld.org