AVE6321621:
United States, c.1950: Teacher stands at head of elementary school classroom filled with students at desks, a girl raises her hand, is called upon, stands and asks a question / Bridgeman Images
AVE6321626:
United States, c.1950: School children play baseball on playground, boy reacts to hearing siren, children drop toys and enter school building / Bridgeman Images
AVE6321638:
United States, c.1950: Older students lead younger students into hallway, older student demonstrates duck and cover while another older student directs attention to his technique / Bridgeman Images