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Full Report of Yury Gagarin to the State Commission after his mission, on April 13, 1961.

Announcement of the launch of the first artificial "sputnik" satellite by the Soviet Union.

Soviet cosmonaut Yuri Gagarin at a press conference in Finland several months after his space flight in 1961.

A recovered part of the original Japanese Type B cipher machine, codenamed "Purple" by the United States, on display at the National Cryptologic Museum in Washington DC.

Signals Intelligence Service (SIS) cryptologists at work at Arlington Hall. Many of these cryptologists were women.

African-Americans kneel on sidewalk outside City Hall in Birmingham, Alabama protesting racial segregation

Photograph showing African Americans participating in the march from Selma to Montgomery, Alabama, at Kelly Ingram Park in Birmingham, Alabama, as firemen attempt to force them to disperse by directing their fire hoses on them as they congregate in…

This image shows one of the 1968 "Chicago Special Olympics" Games held in Soldier Field. The 1968 Games brought around 1,000 athletes with intellectual disabilities together from 26 U.S. states and Canada.

Marlene Dietrich, Bob Hope and Bette Davis in front of the Hollywood Hall of Honor

Cpl. Rudolph E. Engstrom rests in a shell hole on Iwo Jima, holding a piece of shrapnel that wounded him.