AVE6327448: United States, 1950s: hand prepares printing press letters and blocks / Bridgeman Images

AVE6327469: United States, 1950s: man takes notes to boss in office / Bridgeman Images

AVE6327472: United States, 1950s: man polishes machine / Bridgeman Images

AVE6327517: United States, 1950s: animation of printing press machine / Bridgeman Images

AVE6327532: United States, 1970s: miners at shaft lift / Bridgeman Images

AVE6327541: Puerto Rico, 1960s: Boy and girl shake hands / Bridgeman Images

AVE6327547: Puerto Rico, 1960s: Fortress El Morro on the edge of the island / Bridgeman Images

AVE6327565: Puerto Rico, 1960s: Men walk down steps of government building lined with columns / Bridgeman Images

AVE6327580: United States, 1970s: man drives mine vehicle through shaft / Bridgeman Images

AVE6327616: United States, 1930s: Television antennas stand atop houses as actor Milton Berle acts / Bridgeman Images

AVE6327631: Germany, 1940s: A rocket prepares to launch in a testing facility / Bridgeman Images

AVE6327634: Germany, 1940s: A German rocket attempts to launch in 1943 / Bridgeman Images

AVE6327649: United States, 1950s: Low angle views of James Van Allen / Bridgeman Images

AVE6327703: United States, 1950s: A rocket starts to get smoke as it stands next to a launch pad / Bridgeman Images

AVE6327709: United States, 1950s: Dr. Goddard, a pioneer in rocketry, attempts to test his parachute in a field / Bridgeman Images

AVE6327465: United States, 1950s: man types numbers into machine and print receipt / Bridgeman Images

AVE6327471: 1950s: People exit stairway of building / Bridgeman Images

AVE6327474: 1950s: Assistant writes memo, man sits at desk, dictates / Bridgeman Images

AVE6327480: United States, 1950s: newspaper on printing press machine / Bridgeman Images

AVE6327495: 1950s: Hands fold up bill of legislation / Bridgeman Images

AVE6327501: United States, 1950s: man carves individual letters for printing / Bridgeman Images

AVE6327497: United States, 1950s: man uses large key to open door / Bridgeman Images

AVE6327537: Puerto Rico, 1960s: Central plaza in town / Bridgeman Images

AVE6327512: United States, 1950s: hands place paper over printing press block / Bridgeman Images

AVE6327527: United States, 1970s: animation of thorium 234 molecule / Bridgeman Images

AVE6327572: United States, 1970s: man in science lab / Bridgeman Images

AVE6327575: United States, 1970s: miner inspects ventilation shaft in mine / Bridgeman Images

AVE6327590: Puerto Rico, 1960s: Flowers in rainforest / Bridgeman Images

AVE6327617: United States, 1930s: A dog prepares to go to space with different tests / Bridgeman Images

AVE6327626: United States, 1930s: Men carry a small rocket and set it up in an isolated field / Bridgeman Images

AVE6327632: Germany, 1940s: Scientists build a rocket and weapons / Bridgeman Images

AVE6327678: United States, 1950s: Cloud forming after a nuclear explosion / Bridgeman Images

AVE6327671: United States, 1950s: Military officials inspect rockets / Bridgeman Images

AVE6327693: Russia, 1950s: Konstantin Tsiolkovsky writes literature regarding the potential future of space exploration with the invention of rockets / Bridgeman Images

AVE6327704: United States, 1950s: Reporters and newsmen arrive at a US base to witness the launching of a rocket / Bridgeman Images

AVE6327713: 1970s: Children walk along side of road / Bridgeman Images