Julia Vogel 
El reloj [PDF ebook] 

Busy people need to keep track of time. A clock is used to measure seconds, minutes, and hours. Learn about different types
of clocks and the history of clocks in Clock, 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.