• 1 Cooperative Children's Book Center (CCBC)

• 2 Videos, Slides, Films
• 1 Books
• 1 Sound Recordings

• 1 Compact Discs

• 2 History
• 1 Engineering
• 1 Inventors
• 1 Knowledge
• 1 Leonardo, da Vinci, 1452-1519
• 1 Science
• 1 Technological innovations
• 1 Technology
• 1 Technology and civilization

• 1 Ambrose Video Publishing
• 1 Barretta, Gene
• 1 Burke, James, 1936-
• 1 Discovery Productions, Inc.
• 1 Learning Channel (Firm)
• 1 Principal Film Company
• 1 Sattin, Richard
• 1 Slee, Mike
• 1 TLC (Firm)

• 2 English

• 1 Italy

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