AVE6326799: United States, 1960s: A typesetter places the appropriate characters together to form words to be used as a plate. / Bridgeman Images

AVE6326810: United States, 1960s: Working writers at the office pass their articles to be proofread by editor. / Bridgeman Images

AVE6326819: United States, 1960s: Men at work organize printing plates to be used for printing articles. / Bridgeman Images

AVE6326832: 1930s: UNITED STATES: Man milks Jersey cow. / Bridgeman Images

AVE6326844: 1930s: UNITED STATES: surface cooling of milk. / Bridgeman Images

AVE6326857: 1950s: Propeller plane taxis on runway / Bridgeman Images

AVE6326859: 1950s: Pilot grips yoke of plane and struggles to control it / Bridgeman Images

AVE6326862: 1950s: Woman sitting in backyard hands newspaper to man and starts to stand / Bridgeman Images

AVE6326874: 1930s: Table with headers “Grammar School”, “High School”, “College” is divided diagonally, animated hand peels bottom of the chart, image of industrial mining appears / Bridgeman Images

AVE6325824: 1950s: People sit in audience, word Manila appears on screen / Bridgeman Images

AVE6325825: 1940s: Soldier sits at table talking to psychiatrist. / Bridgeman Images

AVE6325832: 1940s: Soldier sits talking. / Bridgeman Images

AVE6325835: 1950s: People sit in audience, listen and watch / Bridgeman Images

AVE6325836: 1940s: Soldier sits talking while looking sad. / Bridgeman Images

AVE6325843: 1950s: Marian Anderson and Asian woman sit down inside Buddhist temple, talk / Bridgeman Images

AVE6325844: 1950s: People sit and listen to Marian Anderson sing / Bridgeman Images

AVE6325852: 1940s: Doctor inspects eye of patient. / Bridgeman Images

AVE6325861: 1940s: Hospital worker speaks. / Bridgeman Images

AVE6325877: 1940s: Patient lies on pillow, speaking with eyes closed. / Bridgeman Images

AVE6325887: 1940s: Patient lies on pillow. / Bridgeman Images

AVE6325891: 1950s: Man talks / Bridgeman Images

AVE6325894: 1940s: Man in group therapy audience speaks of experience. / Bridgeman Images

AVE6325897: United States, 1950s: man in audience listens / Bridgeman Images

AVE6325904: United States, 1950s: lady speaks to boys in school assembly / Bridgeman Images

AVE6325939: United States, 1940s: Boy in bed, doctor and woman exit / Bridgeman Images

AVE6325949: United States, 1940s: Men talk in office / Bridgeman Images

AVE6325962: United States, 1940s: Franklin Delano Roosevelt talks into camera / Bridgeman Images

AVE6325964: United States, 1940s: Social security brochures / Bridgeman Images

AVE6325966: United States, 1940s: President Truman speaks to congress / Bridgeman Images

AVE6325970: United States, 1940s: Exterior of farm colony / Bridgeman Images

AVE6325979: United States, 1940s: Man painting / Bridgeman Images

AVE6325982: United States, 1940s: Women talk at desk / Bridgeman Images

AVE6325985: United States, 1940s: Man talking at desk / Bridgeman Images

AVE6325990: United States, 1940s: Man cuts piece of wood / Bridgeman Images

AVE6326041: United States, 1950s: Firecracker thrown on ground, explodes / Bridgeman Images

AVE6326043: United States, 1950s: Magnified view of particles / Bridgeman Images