LEVRET (André) Essay on the abuse of general rules, and against the prejudices which oppose the progress of the art of childbirth. Paris, chez Prault, Didot le jeune, 1766, in-8, marbled calf, spine ribbed, decorated. ORIGINAL EDITION illustrated with a large folding plate of instruments. - L'art des accouchements démontrés par des principes de physique et de mécanique. Paris, Didot le jeune,1766, in-8, brown bas., spine ribbed, decorated (boards and spine worn). With a portrait and 5 folding plates. Set of 2 vols.