Member of ACLS Offshore Property Rights seminar Contributors Presenter: David Gray Publisher Association of Canada Lands Surveyors Subject (Topical) Hydrographic surveying Extent videorecording, 1 hr. 14 min. 46 sec. Type Moving Image Rights Copyright is held by the Association of Canada Lands Surveyors. Permission to publish, copy or otherwise use this material must be obtained from BCIT Library. Language English