I would not have a Child in Public School any longer...
What a discrace to the American Family.
My understanding is that Calvert also uses the same texts in its prestigious day school as it does in its homeschool curriculum.
I notice that Calvert now is also branching out into partner schools, where they provide support for other schools using their materials as "enrichment." It may be that Across the Centuries is used in that area as well.
To be fair, my daughter's seventh grade *public school* ancient history textbook doesn't even include any mention of Islam, although it does have good treatments of prehistory, the Fertile Crescent, ancient Greece, Rome, and India.