I stumbled across an interesting rich interlinked site of articles the other day. A Social History of Children’s Literature is the labor of Kay E. Vandergrift and what a trip we are taken on. I particularly enjoyed links in the list of illustrators at the end of Early Illustrators of Children’s Books from the 19th and 20th Centuries . That had me lost for hours!
Related to this topic is another site which briefly puts some of the topic in historical perspective. A Brief History of Children’s Literature is a list of key concepts and developments in the history of this genre.