Leonard Gray

• 100 problems in celestial navigation
• How to Navigate Today
• One Hundred Problems in Celestial Navigation
• Scudding
• The Doxford turret ships
• 85 years of shipping under the Maltese Cross, 1881-1966: portrait of a major German shipping company
• 85 years of shipping under the Maltese Cross,1881-1966
• Celestial navigation planning
• The Ropner Fleet, 1874-1974