Revekka and Sergei Shmaria Landau ~1900 Maria Vulih's birth certificate 1903 Revekka Landau 1911 Revekka Landau's university diploma 1914 Veniamin Dal 1914 Revekka Landau and her friend 1915 Maria Vulih and her sister Udel Vulih ~1920 Maria Vulih and her father Lev Vulih ~1920 Ada Dal's family ~1920 Inna Hvatovker ~1930 Sabina Vulih ~1930 Ada Dal 1933 Ada Dal 1936 Ada Dal 1954 Ada Dal, her husband Mihail Ben, and her grandson Alexei Zaslavsky 1997