24:47

Exploration of the Planets (1971)

28:32

Planet Mars: 1979

28:24

Within this Decade: America in Space - 1969

26:29

Eight Months to Mars

27:41

Space Down to Earth (1970)

25:10

The Knowledge Bank (1971)

26:57

Life Beyond Earth and the Mind of Man - 1975

23:49

Nuclear Propulsion in Space