Julia Vogel 
La longitud [PDF ebook] 

Sometimes people need to measure long distances, such as a football field. At other times, they may need to measure something
small, like a tiny dog. Learn about the tools needed to measure how long something is in Length, an All About Measuring book.
Each book in this series helps children learn basic measuring concepts. Simple, engaging text and colorful photos help students
gain a better understanding of measurement fundamentals and encourage a love of reading.