Trenter, N. A. Earthworks : a guide / N. A. Trenter - London: Thomas Telford, 2001 - xiv, 265 p.: ill.; 24 cm. Includes bibliographical references (p. [213]-223) and index. ISBN: 0727729667 Subjects--Topical Terms: Fills (Earthwork)--Great BritainEarthwork--Great Britain