The proper address for a Duke, and thus a Duchess, would be 'Your Grace'.
Note, however, that while a person may be a Duchess, that might not be the only title they have. As an example, Charles, the Prince of Wales is, among other titles, Prince of Wales, Duke of Cornwall, Earl of Carrick and Baron of Renfrew. Thus, he can be addressed as Your Highness, Your Grace, My Lord or Your Lordship, all depending on the situation and/or if he WANTS to use a greater title, and the same applies to his wife, Camilla, Duchess of Cornwall.
It is, however, VERY rude to refer to him by a lesser title if the situation doesn't make it clear that one should.
You may call him your Lordship, , or in an independent Duchy like Luxembourg, Your Highness, as this is the most elevated royalty in this country.
The web address of the Museum Of Art At Duke University is: www.nasher.duke.edu
The web address of the Doris Duke Charitable is: http://www.ddcf.org
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The address of the Sarah P. Duke Gardens is: Duke University, Durham, NC 27708-0342
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The Duke University's (The Fuqua School of Business) address is 100 Fuqua Drive, Durham, North Carolina. They offer several MBA programs like The Duke MBA Daytime, The Duke MBA Cross Continent, The Duke MBA Global Executive and The Duke MBA Weekend Executive.
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Duke University 207 Allen Bldg. Durham, NC 27708 NC Tel. 919-684-8111 Fax 919-684-3200
The address of the Doris Duke Charitable is: 650 5Th Ave Fl 19, New York, NY 10019-6108
Just as Lady Winston[ ex ] , unless her husband has a more elevated title, then you address her a Duchess if he is a Duke, or Pricess if he is a Prince etc.