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| Archive Reference / Library Class No. | D1851/P/7/BD20600-24363 |
| Former Reference | D1851/BOX/32, D1851/BOX/6/30 |
| Title | Technical drawings on microfiche. Numbers BD20600-BD24363 |
| Date | Jul 1963-Apr 1969 |
| Description | Arranged in chronological and "BD" reference order. Each microfiche has outer paper packaging which records the "BD" reference, another number, descriptive title and the date. |
| Extent | 1 box |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | Bryan Donkin & Co. Ltd of Chesterfield, Engineers |
| Appraisal | A microfiche of a Map of Walton estate, 1872, was transferred to the Local Studies microfiche collection as it has no obvious connection to the firm. |
| Arrangement | Items BD600, 972-973, 975-977 relating to paper making machines were deposited separately having apparently been removed as they still have been required for "exhibitions etc." |
| Format | Microfilm |