"To be observed by all workmen employed by the Nova Scotia Coal Company, Black Diamond Colliery," issued by the Superintendent, Willard W. White, 21 June 1873, Pictou County.
Date: 1873
Reference: Nova Scotia Archives RG 21 series A vol. 39 no. 20
Nova Scotia Archives — https://archives.novascotia.ca/meninmines/archives/?ID=15
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