File:1957 - Lehigh Portland Cement Calendar - Allentown PA.jpg
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![File:1957 - Lehigh Portland Cement Calendar - Allentown PA.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/1957_-_Lehigh_Portland_Cement_Calendar_-_Allentown_PA.jpg/396px-1957_-_Lehigh_Portland_Cement_Calendar_-_Allentown_PA.jpg?20200423151152)
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