AVE8906509: 1960s: Sculpture of woman and child. / Bridgeman Images

AVE8906548: 1960s: The Great Seals of Delaware, New Jersey, Pennsylvania and Virginia sit on display. / Bridgeman Images

AVE8906583: 1960s: Man shoveling dirt from pile. / Bridgeman Images

AVE8906571: 1960s: Close up of pulley. / Bridgeman Images

AVE8906590: 1960s: Man shoveling dirt from pile. / Bridgeman Images

AVE8906597: 1960s: Man moving crate on construction site with dolly. / Bridgeman Images

AVE8906596: 1960s: Close-up of sculpture of hand. / Bridgeman Images

AVE8906620: 1960s: Close-up of Michelangelo's The Deposition., Buonarroti, Michelangelo (1475-1564) / Bridgeman Images

AVE8906639: 1960s: Flowers. / Bridgeman Images

AVE8906621: 1960s: Michelangelo's The Last Judgment., Buonarroti, Michelangelo (1475-1564) / Bridgeman Images

AVE8906663: 1960s: man holds chains attached to large piece of metal or girder in outdoor factory area, gestures upward, crane lifts metal / Bridgeman Images

AVE8906742: 1960s: Flowers. / Bridgeman Images

AVE8906700: 1960s: drawing of fuel manufacturing process, oil well derrick to crude oil tank with "vapor space" at top and flames below, vapor line goes to condenser coil, gasoline, kerosene and fuel oil come out / Bridgeman Images

AVE8906703: 1960s: Flowers bloom on branch of tree. / Bridgeman Images

AVE8906707: 1960s: wooden axis rotates oiled wood and metal gear perpendicular to very large wood and metal gear rotating thick metal shaft in wooden building with wood columns / Bridgeman Images

AVE8906720: 1960s: Buds grow on bare tree branches. / Bridgeman Images

AVE8906721: 1960s: Lily. Person uses silver tool to point to parts of flower. / Bridgeman Images

AVE8906697: 1960s: Tweezers grab center of flower. / Bridgeman Images

AVE8906797: 1960s: white smoke pours from chimney in large industrial factory with train cars in front and large vertical tanks in background / Bridgeman Images

AVE8906802: 1960s: man sings and plays mandolin in front of curtain with crepe paper hanging, smiling man in shiny shirt prances in, sings into vintage microphone, seated woman plays in background / Bridgeman Images

AVE8906807: 1960s: Highway. Car passes truck carrying lumber. / Bridgeman Images

AVE8906817: 1960s: Plant with yellow flowers. / Bridgeman Images

AVE8906819: 1960s: Plant with yellow flowers. / Bridgeman Images

AVE8906821: 1960s: Men work at construction site. Town. / Bridgeman Images

AVE8906823: 1960s: teen couples square dance, swing each other around, join hands and circle around in a gym while a country music band with fiddle, mandolin, piano and singer plays music on stage / Bridgeman Images

AVE8906451: 1960s: Shovel digging rocks. / Bridgeman Images

AVE8906460: 1960s: Boy prying nails out of crate. / Bridgeman Images

AVE8906519: 1960s: Hands holding board over pyramid, hands replace pyramid under board. / Bridgeman Images

AVE8906505: 1960s: Medieval man and woman gather hay and work in farm field. / Bridgeman Images

AVE8906499: 1960s: Man standing with weights balanced from scale, points to scale. / Bridgeman Images

AVE8906506: 1960s: Cars and motorcycle drive past medieval wall in European town. / Bridgeman Images

AVE8906507: 1960s: Sculpture of woman and child. / Bridgeman Images

AVE8906513: 1960s: Sculpture of woman and child. / Bridgeman Images

AVE8906522: 1960s: People look at marble sculptures on display in gallery. / Bridgeman Images

AVE8906546: 1960s: Medieval men apply wax seal on parchment with signet ring. / Bridgeman Images

AVE8906659: 1960s: smoke pours from smokestack at industrial factory as truck with "Richfield" painted on it drives by / Bridgeman Images