Was die meisten Amateur- und manche Fachphotographen nicht wissen. 1916, Schmidt, F., (Ikke digitaliseret)
Mechanical equipment of buddings by L. A. Harding & A. C. Willard. I. Heating and ventilation. N. 1916, (Ikke digitaliseret)
Primary Batteries, their theory, construction and use. New ed. 1916, Cooper, W. R., (Ikke digitaliseret)