Kennedy. Sales of the guidebook helped finance the restoration. In a televised tour of the house on Valentine's Day in 1962, Kennedy showed her restoration of the White House to the public. The White House since the Kennedy restoration Congress enacted legislation in September 1961 declaring the White House a museum. Furniture, fixtures, and decorative arts could now be declared either historic or of artistic interest by the president. This prevented them from being sold (as many objects in the executive mansion had been in the past 150 years). When not in use or display at the White House, these items were to be turned over to the Smithsonian Institution for preservation, study, storage, or exhibition. The White House retains the right to have these items returned. Out of respect for the historic character of the White House, no substantive architectural changes have been made to the house since the Truman renovation. Since the Kennedy restoration, every presidential family has made some changes to the private quarters of the White House, but the Committee for the Preservation of the White House must approve any modifications to the State Rooms. Charged with maintaining the historical integrity of the White House, the congressionally-authorized committee works with each First Familyusually represented by the first lady, the White House curator, and the chief usherto implement the family's proposals for altering the house. During the Nixon Administration (1969–1974), First Lady Pat Nixon refurbished the Green Room, Blue Room, and Red Room, working with Clement Conger, the curator appointed by President Richard Nixon. Mrs. Nixon's efforts brought more than 600 artifacts to the house, the largest acquisition by any administration. Her husband created the modern press briefing room over Franklin Roosevelt's old swimming pool. Nixon also added a single-lane bowling alley to the White House basement. Computers and the first laser printer were added during the Carter administration, and the use of computer technology was expanded during the Reagan administration. A Carter-era innovation, a set of solar water heating panels that were mounted on the roof of the White House, was removed during Reagan's presidency. Redecorations were made to the private family quarters and maintenance was made to public areas during the Reagan years. The house was accredited as a museum in 1988. In the 1990s, Bill and Hillary Clinton refurbished some rooms with the assistance of Arkansas decorator Kaki Hockersmith, including the Oval Office, the