Harvard's Office for Scholarly Communication has launched the State Copyright Resource Center.
Here's an excerpt from the announcement:
The State Copyright Resource Center aims to clarify the ambiguity around the copyright status of state-produced works. . . .
In brief, while the U.S. Copyright Act affirms that works produced by the U.S. federal government are ineligible for copyright protection (17 U.S.C. § 105), this law does not assert the same status for works created by state governments. As a result, many states assert a copyright interest in the surveys, reports, and other documents they produce, and many more lack clear legal guidance on the issue. This resource aims to gather the sources of law in each state to provide assistance to those seeking to make use of state-created works.