LITERATURE - HAAG Paul (1842 - 1911) - Visiting cards with autograph lines

Inspector General of the Ponts et Chaussées, professor at the Ecole Polytechnique and the Ecole des Ponts et Chaussées. He wrote several works on public transport and underground railways.
Autograph letter on carte-de-visite: "...je suis allé directement de Dundee à Varsovie."...;
Autograph letter on carte-de-visite in pencil: "pour Dérès avec une carte de M. Jules Ferry”.