the causes which led to its conception; the great undertaking; obstacles encountered; how the work was performed; launch of the crib, etc. : Together with sketches of the visits of several illustrious parties to the works, and a midnight train of cars beneath Lake Michigan : Also, the successfull completion of the great enterprise

choix de lectures de géographie accompagnées de résumés, d'analyses, de notices historiques, de notes explicatives et bibliographiques