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http://webisa.webdatacommons.org/438784666
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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
Aircraft, particularly helicopters, are very difficult to operate during landing when the pilot is unable to observe adequately the motion of the helicopter with respect to the landing area.
http://www.w3.org/ns/prov#wasQuotedFrom
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