Hubbell Trading Post National Historic Site Junior Ranger Training Book by United States. The National Park Service is a great guide for kids who want to learn more about the history and culture of ancient trading posts. This book examines interesting facts about the trade that took place in these places and performs various tasks aimed at learning about this topic. Children will have the opportunity not only to have fun, but also to learn a lot of interesting things about the history of American trading posts. The Hubbell Trading Post National Historic Site Junior Ranger Workbook is the perfect choice for young explorers interested in history and a fascination with places of natural beauty.