Geometry of Four Dimensions; a Sketch of Its History, Importance and Characteristics, with Discussion of the Regular Solids
Metall-Reinigung und -Entfettung. An Introduction to Metal Degreasing and Cleaning ... By A. Pollack and P. Westphal, with the Collaboration of Prof. R. Weiner. Translated from the German and with Some Additions by the Staff of Electroplating and Metal Finishing. With Illustrations.