The Digest of United States Practice in International Law from 1989-2006 and from 2008 is now available at the State Department website. This includes the Digest of United States Practice in International Law 1991-1999, which retroactively covers a period during which publication of the Digest was temporarily suspended. Material from the 2007 Digest is available at a State Department Archive page. The U.S. Department of State's press release concerning online publication of the Digest is available here. Thanks to Lyonette Louis-Jacques at the University of Chicago’s D’Angelo Law Library for the links.

Print copies of the Digest of United States Practice in International Law are available in the Heafey Law Library (1973 – 2007) and via Hein Online (1973 – 1980; SCU affiliates click on “Connect to…” in the OSCAR record), as are earlier international law digests:

Cadwalader (1877)
Wharton’s Digest (1887)
Hackworth's (1940-1944)
Moore’s (1906)
Whiteman’s (1963 – 1973)