1) The document presents several historical photographs taken in the 1930s depicting workers during the construction of skyscrapers in New York City between 1920-1935. 2) The first photograph is titled "Lunch atop a Skyscraper" and was taken by photographer Charles Ebbets on September 29, 1932 on the 69th floor of the GE Building in Rockefeller Center. 3) Many of the images are part of the Bettmann collection, which contains over 11 million photographs including important historical photos of the United States, and is now owned by Corbis which is owned by Bill Gates.