MASKELYNE, Nevil (1732-1811). Concerning the Latitude and Longitude of the Royal Observatory at Greenwich, London: J. Nichols, 1787, 4° (271 x 207mm.), FIRST EDITION, PRESENTATION COPY, inscribed "from the author" to front pastedown, tables in text (marginal browning, some tears), contemporary marbled wrappers (new spine, tear to rear cover repaired, slight wear).