• 1 DVDs

• 12 History
• 12 Technological innovations
• 12 Technology
• 7 Social aspects
• 6 Documentary films
• 2 Air conditioning
• 2 Glass
• 2 Public health
• 2 Recording and reproducing
• 2 Refrigeration and refrigerating machinery
• 2 Sound
• 2 Time measurements
• 1 Drinking water
• 1 Electric lighting
• 1 Inventions
• 1 Inventors
• 1 Mirrors
• 1 Optical instruments
• 1 Sanitary engineering
• 1 Sanitation
• 1 Systems and standards
• 1 Time

• 7 Jones, Julian
• 7 Lovering, Peter
• 6 Kanopy (Firm)
• 6 Nutopia (Firm)
• 4 Olding, Paul, 1973-
• 3 Stacey, Nic
• 1 British Broadcasting Corporation
• 1 Jackson, Michael, 1958 February 11-
• 1 Oregon Public Broadcasting
• 1 PBS Distribution (Firm)
• 1 Petterle, Diene
• 1 Public Broadcasting Service (U.S.)
• 1 Root, Jane

• 12 English

• 1 United States

• 10 Documentary films
• 7 Video recordings for the hearing impaired
• 2 Documentary television programs
• 1 Educational television programs
• 1 Feature films
• 1 Nonfiction television programs
• 1 Science television programs

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