Janey Levy 
Silk Road [PDF ebook] 
Using a Map Scale to Measure Distances

Students will learn about one of the most amazing trade routes in human history. This book uses details about the Silk Road to explain how to use map scale to measure distances. It includes photographs of Silk Road sections, annotated maps with scale explanations, and a concise history of each Great Age. Interesting details about fabrics, goods, and knowledge transported during each time period are also shared.