Charles A. Jortberg Related books The Big Machines (Kids & Computers) Abdo Pub Co • 1997 The First Computers (Kids & Computers) Abdo Pub Co • 1997 The Internet (Kids & Computers) Abdo Pub Co • 1997 The Super Computers (Kids & Computers) Abdo Pub Co • 1997 Virtual Reality & Beyond (Kids & Computers) Abdo & Daughters Publishing • 1997