ARL university libraries report the following holdings as of June 30, 1999. Data are compiled from ARL Web site (http://fisher.lib.virginia.edu/newarl/).
| Type of holding | # of libraries responding | # of holdings |
| Microform units | 111 | 455,866,843 |
| Government documents | 97 | 41,827,671 |
| Computer files | 102 | 578,637 |
| Archives and manus. | 107 | 2,361,544 |
| Cartographic materials | 106 | 27,885,352 |
| Graphic materials | 101 | 64,083,533 |
| Audio materials | 104 | 5,385,634 |
| Video and film | 103 | 1,335,441 |