The Blessing Papers — William Barnwell

Praised by Andre Norton, among others, as an "excellent combination of science fiction and fantasy," The Blessing Papers concerns a post-apocalyptic future set in a fictitious Ireland (Imram), in which the ability to read and write has almost been lost and strange images and religions reign. The action and adventure of the three novels dramatizes through many twists and turns the rediscovery through the Blessing family of an almost forgotten past as portrayed in the final recovery of the hidden Blessing Papers themselves.