Inventions.

Patents, citations, and innovations : a window on the knowledge economy by: Trajtenberg, Manuel; Jaffe, Adam B. (Language materials, printed)

Design by use : the everyday metamorphosis of things by: Stich, Sonja; Wender, Miriam; Brandes, Uta (Language materials, printed)

Innovation without patents : harnessing the creative spirit in a diverse world by: Suthersanen, Uma; Chow, Kit Boey; Dutfield, Graham (Language materials, printed)

Marshall Brain's more how stuff works by: Brain, Marshall (Language materials, printed)

The evolution of useful things by: Petroski, Henry (Language materials, printed)

Put a fan in your hat ! : inventions, contraptions, and gadgets kids can build by: Carrow, Robert S.; Brown, Rick (Language materials, printed)