Explores The Machines Used And The Physics Involved That Make Moving From One Level To Another In A City Environment Easier. Bilingual edition
- Contenidos / Table of Contents
- Edificios de la ciudad / City Buildings
- Subir y bajar / Going Up and Down
- Rampas y esculeras / Ramps and Stairs
- Poleas y elevadores / Pulleys and Elevators
- Glosario / Glossary
- Índice / Index