[Paris? E. Noblet, n.d., but 1858?]. First Edition. Octavo (25cm.); original plain blue side-stitched wrappers; 32pp.; folding engraved plan. Wrapper extremities chipped with some loss to spine, else Very Good, contents and plate fine. Inscribed and signed by the author to the Belgian geologist d'Omalius d'Halloy on half title, with additional note at end of p. 32 dated 1866 regarding changes made to the surveys of various wells bored since this publication. Territories in Algeria covered include Chott ech Chergui, Oued Righ, and Hodna. OCLC locates two copies in North America as of September, 2019, at UCSB and Duke. NUC describes two similar titles by the author.