Abstract from the CLIR announcement page:
"This is the first comprehensive, national-level study of the state of sound recording preservation ever conducted in the U.S. The authors, Rob Bamberger and Sam Brylawski, have produced a study outlining the web of interlocking issues that now threaten the long-term survival of our sound recording history. This study tells us that major areas of America's recorded sound heritage have already been destroyed or remain inaccessible to the public. It suggests that the lack of conformity between federal and state laws may adversely affect the long-term survival of pre-1972-era sound recordings in particular. And, it warns that the continued lack of national coordination among interested parties in the public and private sectors, in addressing the challenges in preservation, professional education and public access, may not yet be arresting permanent loss of irreplaceable sound recordings in all genres."
Find it here: http://www.clir.org/pubs/abstract/pub148abst.html