Marbled boards with gilt tooled cloth spine: Introduction, Harrison 31 pages, 10 plates; Arnold & Earnshaw 67 pages, 3 plates. Originals 1768 and 1806, BHI reprint, 1984.
Facsimile of Papers published by order of the Commissioners of Longitude. Essential reading for anyone with an interest in the topic, made that much better having the introduction by Jonathan Betts.
A fine, clean example of this important reprint that has itself long been out of print.