At the end of June, members and guests of the Suburban Woman's Club of South Plainfield enjoyed a high tea and tour of the Liberty Hall Museum at Kean University.  Liberty Hall was home to New Jersey's first elected governor, William Livingston.  Built in 1772, on the eve of the American Revolution, and passed down through seven generations of the Livingston and Kean families, Liberty Hall has been a silent witness to more than 200 years of American history. A chronicle of New Jersey and American history, as glimpsed through the experiences of one family, this 50-room Victorian-style mansion is a treasure trove of historic riches. The site houses extensive collections including forgotten letters from some of the nation's founding fathers, such as Thomas Jefferson, Alexander Hamilton and John Jay.  The Livingston/Kean family has produced governors, senators, congressman and captains of industry. No less accomplished were the ladies of Liberty Hall who served as astute hostesses and historic preservationists.