Portrait of G. D. Heumann; Frontispiece from Penther's detailed guide to civil architecture; Left: Portrait of G. D. Heumann from the 18th century; right: Frontispiece from Penther's detailed instructions on bourgeois architecture from the 18th century; signed: I. Davison pinx; Fig. 1 & 2; before p. 1; Davison (pin.); 1762; Johann Friedrich Penther: Erster bis vierter Theil einer ausf黨rlichen Anleitung zur b黵gerlichen Baukunst [...]. Theil 3. Augspurg: bey Johann Andreas Pfeffel; Kunstverleger: druckts Johann Jacob Lotter; 1762