Bureaus and offices which were created or underwent substantial change during this period and which are represented here include the United States National Museum; the Museum of Natural History; the Museum of History and Technology; the Smithsonian Astrophysical Observatory; the National Cultural Center, now the John F. Kennedy Center; the Bureau of American Ethnology; the National Portrait Gallery; the National Collection of Fine Arts; the National Zoological Park; the Smithsonian Oceanographic Sorting Center; and the Smithsonian Institution Traveling Exhibition Service. Subject headings appearing in these records include: the Arctic Research Laboratory; the Armed Forces Museum and the National Armed Forces Museum Advisory Board; the earth satellite program; the Canal Zone Biological Area, now the Smithsonian Tropical Research Institute; the Smithsonian's centennial; modernization of Smithsonian exhibits; the Link Foundation; the National Advisory Committee for Aeronautics; the National Air Museum, now the National Air and Space Museum; the National Gallery of Art; the Research Corporation; the Century 21 Exposition, Seattle, 1962; the Smithsonian Science Information Exchange; and the Smithsonian Scientific Series.