The purpose of this legislation is to expand the boundaries of the Marsh-Billings-Rockefeller National Historical Park in Vermont. The goal is to enhance the park's historical and environmental significance by including additional areas and establishing new programs related to conservation and education. Key provisions of the legislation include the expansion of the park's boundaries to include a historic zone featuring the Marsh-Billings-Rockefeller Mansion and surrounding buildings, as well as a protection zone that encompasses the Billings Farm and Museum.