There is abundant activity both above and below the ground as work on the Los Angeles subway continues: crews dig trenches for equipment, miners bore a tunnel in the ground, archeologists excavate ruins at a station site, artists plan artwork for station and tunnel walls. In a fascinating documentary, Joan Hewett describes the many aspects of work involved in building the L.A. subway system as she introduces readers to some of the people who are doing the many and varied jobs required. Color photographs capture the work-in-progress, from deep within the newly-dug tunnels to a supervisor's office high above the ground. (Ages 7-10)