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 History of Seaham - Stories and remarkable and memorable events in the history of Seaham 
 The Chemical Works at Seaham 
 Patent lodged by John Watson, Seaham Chemical Works (September 1868)
 History of Seaham - Stories and remarkable and memorable events in the history of Seaham 
 The Chemical Works at Seaham 
 Patent lodged by John Watson, Seaham Chemical Works (September 1868)
