Approver Comments:
I agree you've found a direct match for the student who signed the album. In 1941 he would have been 13 years old, the right age to attend school #13b. In the future, please leave a comment for me and your fellow researchers explaining how you came to your conclusions.
You might also want to check out Abram Grinbaum, born in 1930, as another possible candidate.
What do you think the ghetto note means? On the next stage, use the secondary sources to try to figure out what that note means about Abraham and where he went in the ghetto.
