Found in
| Sloot, H. De Nederlandse sleepvaart, c1983.
Encyc. international (Tugboat ... specially designed tugs are capable of transoceanic towing jobs)
Merit students encyc.: v. 17, p. 19, article Ship ("one notable long-distance tow was the towing of the off-shore drilling rig Mister Cap from Orange, Tex. to Rotterdam, Holland, by the Dutch tug Zwart Zee, a distance of 5,500 nautical miles")
Random House (Tug; Tugboat)
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