Sorry--LorenaBR--that last reply was posted by me. Instead of signing in where "Name" is, I accidentally put the "Subject."
Check out http://www.copyright.gov/orphan/index.html
It's a place that the U.S. Copyright Office provides for reporting copyright "orphans": when people attempting to seek permission and authorization from copyright holders can't identifiy the copyright holders no matter how hard they try. The reports posted there may become public, it says; so please keep that in mind.
I was stimulated to find that link (hope I posted it right) first at http://www.culturecat.net (a blog on "rhetoric and feminism," by a Ph.D. candidate in English, leading me first to http://www.orphanworks.org and then to the U.S. Copyright Office link there.
