I'm putting this in a separate thread from a proposed field trip to see this exhibit, because there's information here that might be of more general interest:
The Maryland Historical Society has an exhibit of Maryland Schoolgirl samplers. There are a couple of illustrated pages online that you might find interesting, and with news of a book about to be published:
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you go to the main website and download the whole MDHS News magazine from which those pages are taken, there's another article on an anti-slavery quilt that you might like:
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Sue