The Seven Sisters Colleges is a group of women's colleges founded during the nineteenth century. Its members in chronological order are Mount Holyoke, Vassar, Wellesley, Smith, Radcliffe, Bryn Mawr, and Barnard College.

The Seven Sisters, a consortium of prestigious East Coast liberal arts colleges for women, originally included Mount Holyoke, Vassar, Smith, Wellesley, Bryn Mawr, Barnard, and Radcliffe colleges. Mount Holyoke is the "Mount" of the seven.

http://www.mtholyoke.edu/about/seven_sisters.html

The Seven College Conference is a consortium of women's colleges, conformed by 'The Seven Sisters', originally only Vassar, Wellesley, Smith, and Mount Holyoke, later Barnard, Bryn Mawr and Radcliffe joined. It was formed officially in the year 1926.

We Were Seven Sisters was created in 1939.

The Seven Sisters was written by Margaret Drabble