Cald wells screw tug design

Eitemau Tebyg

• Screw tug design rev by Jeffrey N Wood /
  gan: Caldwell, Allam
  Cyhoeddwyd: (1969)
• Tugs, towboat and towing
  gan: Brady, Edward M
  Cyhoeddwyd: (1967)
• The fifth international tug convention
  gan: Troup, D Kenneth Ed. by
• Marx and the Third world Tr by Pat Ransford and ed by Malcolm cald well /
  gan: Melotti, Umberto
  Cyhoeddwyd: (1977)
• The design of marine screw propellers
  gan: O'Brien, T P
  Cyhoeddwyd: (1969)