The size of libraries in the United States is determined by a number of metrics, including number of holdings (in terms of volumes or titles held), by circulation (i.e., library materials checked out or renewed); or by number of library visits.
The size of libraries in the United States is determined by a number of metrics, including number of holdings (in terms of volumes or titles held), by circulation (i.e., library materials checked out or renewed); or by number of library visits. (en)