I have just gone through this appraisal process. I have a 40 year old archive of sound recordings that I did for my first documentary film project in the Appalachian Mountains with Bascom Lamar Lunsford back in 1964. I want to sell my archive to an individual who donates to the Library of Congress, who wanted desperately to have. I had to find sound experts who is evaluated the archive from three perspectives. number one -- what is its intrinsic value of it? Number two-- What money could it make if copied for music CDs and DVDs? Number three -- Are there other ancillary values that can be added? I went to an expert in the music industry connected to Butterfield and the appraisal costs be $2000. It was well worth it. If there is any more help that I can be, just e-mail me. Best Regards, David Hoffman www.thehoffmancollection.com