Hensen, Henk creator text 03 England The Nautical Institute 2003 2nd monographic xiii,192p.: ill. Tug design factors. Types of harbor tug. Assisting methods. Tug capabilities and limitations. Interaction and tug safety. Tug developments "Includes Index". Tug design factors Towing equipment Escort tugs 387.166 HEN 1870077393 200103