L. Bäcksbacka: "Narvas och Nyens Guldsmeder", (The Goldsmiths of Narva and Nyen), printed by Konstsalongens förlag, Helsinki 1946, numbered 393/500. Sewn as issued. 21x15.5 cm. In Swedish.
L. Bäcksbacka. "S:t Petersburgs juvelerare, guld- och silversmeder 1714-1870" (The Saint Petersburg jewellers, gold smiths and silversmiths 1714-1870), printed by Konstsalongens förlag, Helsinki 1951, numbered 316/500. Sewn as issued. Partially uncut. 24.5x16 cm. In Swedish.
Dr. W. Neumann: "Verzeichnis baltischer Goldschmiede, ihrer Merkzeichen und Werke" (Baltic goldsmiths, their marks and works), W.F. Häcker, Riga 1905 and Adolf Friedenthal: "Die Goldschmiede Revals" Lübeck 1931. Half calf. 23.5x16 cm. In German.

Normal wear. "Narvas och Nyens Guldsmeder" with insignificant wear.