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| Archive Reference / Library Class No. | NCB/H/BUT/7/1 |
| Former Reference | N36/3/7/1 |
| Title | Draft specification for sinking a shaft from the Top Hard Coal to the Blackshale or Silkstone Coal at Kirkby Colliery, prepared by the Butterley Company for a contract with Frank Coulson |
| Date | Jan 1912 |
| Description | With memorandum attached on the contract being dependant on the making of an agreement between the company and the Duke of Portland for the lease of the Lower Mines, 17 Jan 1912 |
| Extent | 1 item |
| Level | Item |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |