Steven Otfinoski

A Step Into History: World War I

A Step Into History: The Great Depression

A Step Into History: The Cold War

A Step Into History: World War II

Calling All Innovators: High Speed Trains [Paperback] Steven Otfinoski

World War I (A Step into History)

World War II (A Step into History)

Making Robots: Science, Technology, and Engineering (Calling All Innovators: A Career for You)

Drones: Science, Technology, and Engineering (Calling All Innovators: A Career for You)

Making Robots

Air Travel: Science, Technology, Engineering (Calling All Innovators: A Career for You)

High-Speed Trains: From Concept to Consumer (Calling All Innovators: Career for You) (Calling All Innovators: A Career for You)