This is a print on demand publication. An annotated translation based on a collation of the Selestat and Phillipps-Corning (PC) manuscripts, with a reproduction of the two manuscripts. Contents: (1) The manuscripts and their background: The Selestat manuscript; The PC manuscript; Sir Thomas Phillips’s pub. in “Archaeologia,” 1847; Note on chap. enumeration; Table of concordance between manuscripts; A note on the translation; The “Mappae Clavicula” as a source for the history of technology; and The background and place of the “Mappae Clavicula” in the history of art; (2) The translation; (3) Appendices: Photorepro. of the Selestat manuscript; Photorepro. of the PC manuscript; and A note on the runes; and (4) Bibliography. This is not an original: it is copied on-demand.