![The correspondence of Gray [and others] (1734-1771) including more than one hundred letters now first published, chronologically](https://i0.wp.com//acdf90ad566ea54c819b792cba1d99b7bc3340180a46f317e56ee1d425194b13?ssl=1)
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St John's College, Cambridge

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Digital gallery - National Library of Scotland

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Memorial University Research Repository - Memorial University of Newfoundland

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ResearchGate

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Electric Scotland

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World Radio History

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NIST Technical Series Publications - National Institute of Standards and Technology

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St Thomas University
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