The data displays the average size of academic library collections in higher education institutions that granted doctorial degrees in the U.S. in 2015, by item type. As of 2015, post-secondary education institutions in the United States that granted doctoral degrees had 1.8 million physical books in their collections on average.
Books physical | 1844765 |
Books digital | 570441 |
Media physical | 510654 |
Media digital | 239268 |
Serial titles digital | 98388 |
Serial physical | 43181 |
Databases digital | 463 |