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| Author | Pliny, the Elder. |
| Title | Extracts from The natural history of Pliny. |
| Source | The natural history of Pliny / trans., with copious notes and illus. by the late John Bostock and H.T. Riley; vol.3 pp. 214, 215, 218, 219-223, 238, 239, 254, 255. |
| Year | 1855-1857. |