The Doheny Memorial Library stacks can hold a maximum of 575,000 volumes.
There were 505,887 as of May 2014, so we are rapidly reaching full capacity.
Furthermore, we have added the following number of new books:
Adding another 20,000 volumes in 2014/15 without transferring any will bring the total to about 525,000, and it will be completely full within about 3 years if we continue the current pace of acquisitions.
Masoud Farajpour has kindly provided capacity statistics broken down by call number.