Only vol. 2 has imprint date 1780
Vol. 1 has 9 gatherings, signed OA-OI*8, and numbered CCXXV-CCCLXVIII, bound between p. 224 of part 1 (O8v) and p. [225] (P1r) (half-title of part 2)
With half-titles, head- and tailpieces
Vol. 1 first published 1778, under title: Lettres physiques et moreles sur les montagnes et sur l'histoire de la terre et de l'homme
"Avertissement:" v. 1, p. [vii]-viii
"Avis au lecteur," at end of v. 1, part 1, discours XIV: p. [CCCLXIII]-CCCLXVIII
With dedication of 1st edition, dated 1er janvier 1778.
Copy 1 Vol. 1 Note: Vols. ii and iii have second half-title 'Lettres physiques et morales, sur les montagnes, etc.'; this was used as title for a volume published separately in 1778 but originally intended to be pt. i of this work.
