Hoya-Weser: Verlag Petzold-Druck 1931. VIII, 218 pages. 8vo. Publisher's black pebbled cloth gilt. Text in German. IINSCRIBED "Respectfully presented by author Alf Schroder Berlin, 15 VIII ??!" at top of title page. Very Good. Cloth. 
Title loosely translated is "Development of grinding technology up to the middle of the 19th century"