Rosenbohm E., Grunmach L. The forces of nature and their use. In Russian (ask us if in doubt)/Rozenboom E., Grunmakh L. Sily prirody i pol'zovanie imi. Mechanics or teaching about motion. Physical phenomena and forces, their study and use for practical purposes St. Petersburg Akz Printing House, Brockhaus-Ephron, Praceshestny pereulok, # 6 1904. 632 c. SKUalbc8da65a13489c61a.