There are brochures on the website for the Society of American Archivists that would be a good start for explaining to donors what various concerns need to be addressed in making a donation.
http://www.archivists.org/publications/free.asp
Deeds of Gift: What Donors Should Know
Guide to Donating Your Personal or Family Papers to a Repository
Guide to Donating Your Organizational Records to a Repository
THese are designed primarily for potential donors who are planning to donate personal papers and go into copyright implications (there is a difference between physical ownership and intellectual ownership) but I think could easily be adapted to suit museum situations.
Holly Wilhelm
Virginia
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