Each of these studies has at least one file that is not downloadable.

As of June 30, 2023, ICPSR had 2.4K restricted studies, 13.5K restricted datasets, 130.4K restricted files, 10.5K ASCII data files, 25.1K SAS setup and transport files, 19.2K SPSS setup, portable, and system files, 32.2K Stata setup, system, and dictionary files, and 26.8K documentation files.
Note that counts include only studies identified as 'study' (no union-catalog entries and no CD-ROMS, and include only studies which have not been marked 'RESTRICTED' (which usually means deaccessioned or replaced).
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