[DOC] [TLE] The State of Pennsylvania - An Introduction the Keystone State from ... [PAR] Feb 25, 2016 ... A keystone is a central wedge in an arch that locks all other pieces of an ... 
Pennsylvania's popular nickname, "The Keystone State," refers to ... the theme of 
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origin is unknown, it's certain that it was in .... TOP OF PAGE Top of page. [DOC] [TLE] What is Pennsylvania's state nickname? | Reference.com [PAR] The state nickname of the commonwealth of Pennsylvania is "The Keystone State
. ... from Pennsylvania's central position among the original 13 colonies and its... [DOC] [TLE] Pennsylvania State Nickname | The Keystone State [PAR] Pennsylvania's nickname is "The Keystone State" because it was the middle 
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: EFFLORESCENCE OF NORTH SIDE CHAPEL ARCH 70 ... 'Graveyards and 
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STATE OF VIRGINIA Its humble and tragic beginning  Its magnificence and its 
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Question: Mentioned in Pennsylvania's state nickname, it's the central topmost support of an arch
Answer: Keystone