• 24 Videos, Slides, Films

• 4 DVDs

• 10 History
• 9 Social aspects
• 7 Technology
• 5 Business enterprises
• 4 Computers
• 4 Economic aspects
• 4 Electronic commerce
• 4 Leadership
• 4 Management
• 2 Air conditioning
• 2 Business
• 2 Communication in politics
• 2 Data processing
• 2 Electric lighting
• 2 Facebook (Electronic resource)
• 2 Glass
• 2 Inventions
• 2 Moral and ethical aspects
• 2 Political aspects
• 2 Public health
• 2 Recording and reproducing
• 2 Refrigeration and refrigerating machinery
• 2 Research
• 2 Social media

• 24 Public Broadcasting Service (U.S.)
• 10 Films Media Group
• 5 WGBH (Television station : Boston, Mass.)
• 4 Films for the Humanities & Sciences (Firm)
• 3 Lyman, Will, 1948-
• 3 PBS Distribution (Firm)
• 3 Pogue, David, 1963-
• 2 Bourg, Anya
• 2 DOX Productions Ltd.
• 2 Films à Cinq
• 2 Jacoby, James (Television producer)
• 2 Left/Right (Firm)
• 2 McCabe, Daniel
• 2 Priest, Dana
• 2 Robertson, Megan
• 2 Robinson, Jeannette
• 2 Sington, David
• 2 Sington, Hugh (Television producer)
• 2 Takal, Pierre
• 2 Vargas, Kevin
• 1 APM Music (Firm)
• 1 Arledge, Elizabeth
• 1 Barro, Andri
• 1 Bicks, Michael
• 1 Big House Productions

• 24 English
• 1 Spanish

• 5 United States
• 2 China
• 1 Earth (Planet)

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