Freeman Bibliographical Database
| Identifier: | A6530 |
| Date: | 1867--1868 |
| Concise reference: | Belt, Thomas. 1867-1868. On the 'Lingula flags,' or 'Festiniog group' of the Dolgelly district. Geological Magazine 4: 493-495, 536-543; 5: 5-11, pl. II. [Darwin Pamphlet Collection] |