Main Stacks also known as Gardner Stacks are located under the Doe Library and is connected to Moffitt Library. It was named after the 15th University of California President David P. Gardner. It was built in 1997 to house the growing library collections . It has four underground floors with 400 available seats and group study rooms. The whole area is meant for quiet study but Level B-East is allocated as a silent study area . The regular hours are from 9 am to 10 pm.