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The History of Allentown City – Lehigh Valley History
Allentown, Pennsylvania - Wikipedia
Allentown | City in Pennsylvania, Manufacturing | Britannica
Allentown: History - City-Data.com
Then and now: See how Allentown has changed over the years
Wikipedia
History of Allentown, Pennsylvania
Allentown, Pennsylvania - Wikiwand
Allentown, Pennsylvania - Simple English Wikipedia, the free …
Allentown – Travel guide at Wikivoyage