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| Archive Reference / Library Class No. | NCB/A/BUT/8/3/94 |
| Former Reference | N5/369 |
| Title | Plan showing breaks in the roof and measurements taken from floor to Comb Coal in 31s Gate on North District, Portland Colliery, including section |
| Date | 30 Jun 1909 |
| Description | Scale 4 feet to 1 inch, drawn by HBW. In envelope addressed to H. Eustace Mitton, Colliery Offices, Codnor Park |
| Extent | 1 item |
| Level | Item |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |
| Dimensions | 95cm x 50cm |