September 9, 1968
Episode: 9x01 | Airdate: Sep 19, 1968
Episodes
Thomas Edison
Episode: 9x02 | Airdate: Sep 26, 1968
Human Engineering
Episode: 9x03 | Airdate: Oct 3, 1968
Materials
Episode: 9x04 | Airdate: Oct 10, 1968
Structure
Episode: 9x05 | Airdate: Nov 7, 1968
Communications
Episode: 9x06 | Airdate: Nov 14, 1968
Canals and Tunnels
Episode: 9x07 | Airdate: Nov 21, 1968
Central Power
Episode: 9x08 | Airdate: Nov 28, 1968
Man and Machines
Episode: 9x09 | Airdate: Dec 5, 1968
Land and Water
Episode: 9x10 | Airdate: Dec 12, 1968
Man Aloft
Episode: 9x11 | Airdate: Dec 19, 1968
Portable Power
Episode: 9x12 | Airdate: Dec 26, 1968
Transportation
Episode: 9x13 | Airdate: Jan 2, 1969
Systems Engineering
Episode: 9x14 | Airdate: Jan 9, 1969