The genuine copies of letters which passed between His Royal Highness the Duke of Cumberland and Lady Grosvenor : Her Ladyship's letters to the Hon. Miss Vernon, ... the anonymous letters, signed Jack Spratt, ... To which is prefixed, a clear ... account of the trial ... on the 5th of July 1770; wherein ... Lord Grosvenor was plaintiff, and ... the Duke of Cumberland, defendant. - Henry Frederick, (printed for J. Wheble,, 1770)