Your primary sources that reveal children at work and at school during the same time period will certainly give students a chance to look more closely at those two perspectives. Have you thought about adding some primary sources for children at play? Carolyn Bennett who was the Teacher in Residence at the Library last year has posted a beautiful album which she called Songs for Children to Sing and Dance and Play. https://tpsteachersnetwork.org/album/52668-songs-for-children-to-sing-dance-and-play
--Ann