• 2 Geology and Geophysics Library (Leith)

• 2 Clementine Mission (U.S.)
• 2 Exploration
• 2 Satellites
• 2 Space flight to the moon

• 3 Geological Survey (U.S.)
• 3 United States. National Aeronautics and Space Administration
• 1 Malin Space Science Systems
• 1 Planetary Geology and Geophysics Program (U.S.)
• 1 Voyager Imaging Science Team (U.S.)

• 2 Moon
• 2 Neptune
• 2 Triton (Satellite)

Limit year range