Amie Jane Leavitt 
National Parks Volunteer [PDF ebook] 

The National Park Service (NPS) is a government agency that relies heavily on the help of volunteers. This includes keeping trails clean, guiding visitors on tours, and assisting with scientific research. Learn how volunteers can help maintain and improve the country’s natural spaces in National Park Volunteer.
Each book in the Volunteer Jobs series focuses on the importance of voluntarism, while offering detailed descriptions of volunteer positions and advice for how to apply for them.