Washington, PA elementary school, about 1930
We think the young girl standing next to the teacher is Anna Belle Waltz. These students look to be about 10-11 years old. That would put the date at about 1931-1932. Assuming that there were more than one elementary school in Washington in the 1930s, the Waltz family lived on Campbell Avenue. This would be the school in that area of the city.
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