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| Author | : | Sharpe, D. |
| Year of publication | : | 1850 |
| Title | : | On the Secondary district of Portugal which lies on the north of the Tagus. |
| Journal | : | Quarterly Journal of the Geological Society of London |
| Vol/No/Pages/Plates | : | 6: 135-201, 8 figs., 13 pls. |
| Published in | : | London |