[Ms. notebooks, chiefly in German, for engineering courses at Technical University of Karlsruhe (1841-5) of Louis Wolf, and at Technische Hochschule, Aachen (1885-1890) of his son, Hans Wolf. Louis (i.e. Johan Georg Louis, 1823-1898, later worked as a locomotive designer in Stuttgart; Hans worked as a chemist for J.H. Darby at Brymbo ironworks, N. Wales. Collection includes an analysis of iron and steel produced at various locations in England and Germany, 1885-1900. 1 box]