• 4 Videos, Slides, Films

• 1 DVDs

• 4 Technological innovations
• 4 Technology
• 3 Social aspects
• 2 Documentary films
• 2 Glass
• 1 Air conditioning
• 1 Electric lighting
• 1 Inventions
• 1 Inventors
• 1 Mirrors
• 1 Optical instruments
• 1 Public health
• 1 Recording and reproducing
• 1 Refrigeration and refrigerating machinery
• 1 Sanitary engineering
• 1 Sound
• 1 Time measurements

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

• 4 English

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

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