"निष्कर्षण": अवतरणों में अंतर

* [https://web.archive.org/web/20100324142211/http://www.dredgers.nl/ Directory of Dredgers] (a close to exhaustive private collection of dredger photographs)

* [https://web.archive.org/web/20080314090846/http://www.idredge.com/ News and Equipment Exchange] (Latest global news and equipment)

* [https://web.archive.org/web/20100408125146/http://www.sandandgravel.com/ Dredging News]

* [httphttps://web.archive.org/web/20070928020541/http://www.gbrmpa.gov.au/__data/assets/pdf_file/0003/7869/DredgeandSpoil.pdf Dredging and Spoil Disposal Policy] ([[pdf]])(from the [[Government of Australia|Australian Government]])