Instruction sur les mesures déduites de la grandeur de la terre
De l'Imprimerie de Saphoux, A Macon, an 2 [i.e. 1793 or 1794]
This is the first edition of the official manual of the metric system and the first description of the system as it exists today. It was produced the year prior to the compulsory adoption of the system in France. In addition to this copy, the Dibner Library also has versions printed in Paris and Périgueaux. The book is credited as being by René Just Haüy (1743-1822).