Gr 7 Up-This well-researched account is packed with detailed information about the technical principles of construction, architectural features, and maintenance of these important ancient structures. In-depth discussions about the design of bridges and tunnels are also included. Extensive use of quotes from primary and secondary sources present interesting descriptions of life and customs along the road and the problems that needed to be addressed-both technical and administrative-to make these structures possible. Sidebars provide biographical material about major designers and builders. The generally small black-and-white diagrams, photographs, and reproductions are informative but bland. Overall, a well-organized, lucidly written resource.-Cynthia M. Sturgis, Ledding Library, Milwaukie, OR Copyright 2001 Cahners Business Information.