The Harleian Society is a text publication society founded in 1869 for the publication of manuscripts of the heraldic visitations of the counties of England and Wales, and other unpublished manuscripts relating to genealogy, armory, and heraldry in its widest sense. Since its inception, the Society has published more than ninety volumes of parish registers, fifty four volumes of heraldic visitations, and seventy volumes drawn from other sources.

The Wikipedia page is [1] and the website is [2].