The following guides provide more information about digital collections you may want to browse besides those listed here:
These collections are likely to be of interest for the history of children's literature and may provide useful media for integration into Scalar. If you find something useful, be sure to look for license information and collect any details you need for giving credit or obtaining permission.
These collections may all have images or other media, or simply pdfs or other full text of historical works you want to use.
These resources focus on children's literature specifically.