File:1917 - Allentown High School Chemistry Laboratory Classroom Allentown PA.jpg
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![File:1917 - Allentown High School Chemistry Laboratory Classroom Allentown PA.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/1917_-_Allentown_High_School_Chemistry_Laboratory_Classroom_Allentown_PA.jpg/800px-1917_-_Allentown_High_School_Chemistry_Laboratory_Classroom_Allentown_PA.jpg?20161029230038)
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