Inscription on the back (translated from the Yiddish):
For remembrance to S. Verbukh from Cousin Kagan. Dubno, May 19, 1921
AT FIRST I KNEW ONLY that he was one of the brothers from Poland who were engineers in France, as my mother had indicated in her letter to the American Friends. His eyes haunted me, spurred me to continue my search. Later, I would discover, through documents from Belgium, that this photo was the older brother, Uszer Kahan.