Hermann Lichtenberger, Idar-Oberstein, Germany, c. 1900

An undated cabinet photo shows Hermann Lichtenberger, in a photo studio in Idar-Oberstein, Germany. Photo: Alexander Schmidt

Christian Nagel Family, Birkenfeld, Germany, c. 1897

An undated cabinet photo shows Christian Nagel (right) and his family in Birkenfeld, Germany. Scan © Mark Zanzig/zanzig.com

An undated cabinet photo shows Philipp Lichtenberger (front row, 2nd from left) and his family in a photo studio in … More

UNDATED – A portrait of Kurt Pahlke in Germany. Photo: Otto Stiegler, Itzehoe

UNDATED – A portrait of Wilhelmine Rave of Süderauerriep near Krempe in Germany. Photo: Hans Martens, Krempe

An undated cabinet photo shows Otto Davieds, a student at the Marutendorf farm, in a photo studio in Kiel, Germany. … More

1906 – A cabinet photo shows the three kids of Julius Nikolaus Heuer and Franziska Dorothea Konermann, in Kiel, Germany. … More

UNDATED – A cabinet photo shows Martha Minna Rößler (1892-1978) in a photo studio in Kiel, Germany. Photo: Kurt Scherf

c. 1895 – Portrait of Dorothea Pries (called Fürst) in a studio in Hamburg, Germany. Scan © Mark Zanzig/Zanzig.com/Photo: Knackstedt … More

C. 1885 – Portrait of an unknown lady, taken in Burnley, United Kingdom. © by Mark Zanzig/zanzig.com/Photo: Joseph Wilkinson