• 42 Videos, Slides, Films

• 42 Physical sciences
• 29 Outer space
• 27 Space flight
• 25 Exploration
• 10 Solar system
• 6 Galaxies
• 6 Space
• 6 Stars
• 4 Physics
• 3 History
• 3 International relations
• 3 War
• 2 Aeronautics
• 2 Aerospace engineering
• 2 Engineering
• 2 Manned space flight
• 2 Outer space--Exploration
• 2 World politics
• 1 Animal behavior
• 1 Behavior
• 1 Biology
• 1 Life sciences
• 1 Mechanics
• 1 Reconstruction (1939-1951)

• 42 Infobase

• 37 English
• 5 Unknown

• 3 United States
• 1 Russia (Federation)

• 42 Internet videos
• 34 Video recordings for the hearing impaired

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