48 p. : col. ill. ; 22 cm.
Includes bibliographical references (p. 44) and index.
Easy does it -- Getting around -- Lift and lower -- So many simple machines! -- Ramp it up -- Break apart and hold together.
Examines ancient machines with timelines and photos, including how they have been used throughout history.
9780531263242 (library binding)
053126324X (library binding)