Peter Hirtle writes in the Archives list:

A new version of the copyright duration chart, "Copyright Term and
the Public Domain in the United States," is now available at a new
URL: http://www.copyright.cornell.edu/public_domain/.

The biggest change is that, at the request of a user, two new
sections have been added. The first is on published and unpublished
sound recordings, and the second is on architectural works. Other
small changes have been made to clarify some of the problems other
readers have identified. In order to facilitate printing, a PDF
version of the file is available as well.