Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Dolaucothi Estate (Wales), 1 canlyniadau
- Smyth, Warington W. Sir, (Warington Wilkinson), 1817-1890., 1 canlyniadau
- Playfair, Lyon Playfair, Baron, 1818-1898, 1 canlyniadau
- Geological Survey of Great Britain., 1 canlyniadau
- Geological Museum (Great Britain), 1 canlyniadau
- De La Beche, Henry T. (Henry Thomas), 1796-1855, 1 canlyniadau
- Aveline, William Talbot, 1822-1903, 1 canlyniadau
- Bristow, Henry W. (Henry William), 1817-1889., 1 canlyniadau
- Forbes, Edward, 1815-1854, 1 canlyniadau
- Nichol, John Pringle, 1804-1859., 1 canlyniadau
