To celebrate National Dental Hygiene Month, the Smithsonian Institution Archives presents photographs of dentists and dental researchers.

At the Pan-American Exposition in Buffalo, New York, visitors view a papier mache replica of a Triceratops skeleton made by Frederic Lucas, assistant curator in the Section of Vertebrate Fossils at the United States National Museum, 1901.

Buildings and grounds at Cotton States Exposition, Atlanta, Georgia, featuring "Mystic Maze" and ferris wheel, 1895.

Organ built by John Brown Organ Co. on exhibit at Cotton States Exposition, Atlanta, 1895.

Advancing peace requires a strong, wide, and active network.

Bear skin on exhibit at the Panama-Pacific International Exposition, San Francisco, California, 1915.

The historical legacy of amatuer photographer Julian Papin Scott (1877-1961) is far greater than was acknowledged at the time, because of both who he photographed and how he set up the images.

Conservators from Smithsonian Institution Libraries in the rare books conservation lab at North Capitol Street Services Center, December 4, 1979.

The photographs of Julian Papin Scott (1877-1961) preserve significant glimpses of scientific laboratories during the 1910s and 1920s. Part 1 describes Scott's life, his hearing disability, and how and why he came to make several thousand portraits of scientists.

Diving consultant Joseph Libbey, the first nationally certified instructor in the D.C. area, who taught and certified Smithsonian curators, technicians, and specialists as divers in connection to their work, as well as accompanied teams of scientists on a number of Smithsonian collecting expeditions to gather specimens and supervise other divers, August 30, 1979.