Includes bibliographical references (page 30) and index.
Contents:
Going underground -- Planning a tunnel -- Start digging! -- Under mountains and waves.
Summary:
Describes the history of tunnels, examines how engineers plan a tunnel, details the construction of different types of tunnels, and presents noteworthy examples.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.