AVE6327435: United States, 1950s: workers in printing press factory / Bridgeman Images

AVE6327436: 1910s: Soldiers march down city street / Bridgeman Images

AVE6327439: United States, 1950s: printed words on paper / Bridgeman Images

AVE6327440: United States, 1950s: printed words on paper / Bridgeman Images

AVE6327442: United States, 1950s: printing machine at work / Bridgeman Images

AVE6327453: United States, 1950s: man carves printing sheet / Bridgeman Images

AVE6327468: 1950s: Airplane flies over landscape, Washington Monument / Bridgeman Images

AVE6327470: United States, 1950s: Lady talks to man in office / Bridgeman Images

AVE6327473: United States, 1950s: Man and lady at office desk / Bridgeman Images

AVE6327476: United States, 1950s: man works at desk / Bridgeman Images

AVE6327477: United States, 1950s: man works at machine / Bridgeman Images

AVE6327481: 1950s: Man in suit and tie gets up from desk, speaks at window / Bridgeman Images

AVE6327487: United States, 1950s: fingers press picture in dough / Bridgeman Images

AVE6327488: 1950s: Nighttime Capitol Building / Bridgeman Images

AVE6327491: United States, 1950s: man uses mallet and wood to print on paper / Bridgeman Images

AVE6327492: United States, 1950s: cartoon strip printed on paper / Bridgeman Images

AVE6327498: United States, 1950s: written text on printed book / Bridgeman Images

AVE6327500: 1950s: Men in suits sit around table in discussion / Bridgeman Images

AVE6327505: United States, 1950s: hand uses ladle to pour hot metal into mold / Bridgeman Images

AVE6327508: 1950s: Hand bangs gavel on podium / Bridgeman Images

AVE6327511: United States, 1950s: man sets up letters in printing press block / Bridgeman Images

AVE6327519: United States, 1950s: man loads paper into machine / Bridgeman Images

AVE6327521: United States, 1970s: cactus plants in desert / Bridgeman Images

AVE6327523: United States, 1970s: view across desert landscape / Bridgeman Images

AVE6327526: United States, 1970s: animation of radioactive isotopes moving / Bridgeman Images

AVE6327545: United States, 1970s: miner drives underground train / Bridgeman Images

AVE6327549: United States, 1970s: man sprays white paint on mine wall / Bridgeman Images

AVE6327551: Puerto Rico, 1960s: Boy and girl stand together, boy points girl watches / Bridgeman Images

AVE6327554: Puerto Rico, 1960s: Heavy machinery excavates muddy soil / Bridgeman Images

AVE6327557: United States, 1970s: miner tests air in shaft / Bridgeman Images

AVE6327558: United States, 1970s: miner tests air flow inside mine shaft with machine / Bridgeman Images

AVE6327563: United States, 1970s: miner climbs through door / Bridgeman Images

AVE6327569: Puerto Rico, 1960s: Man drives tank-treaded tractor through field / Bridgeman Images

AVE6327577: United States, 1970s: men flick through pictures in office / Bridgeman Images

AVE6327581: Puerto Rico, 1960s: Man on platform monitors steel pipe loading sugar onto ship / Bridgeman Images

AVE6327592: United States, 1970s: man moves pipe inside mine / Bridgeman Images