Cyfyngwch eich canlyniadau yn ôl:
- Pob un
- Howard, Richard, Reverend, 2 canlyniadau
- Llandudno New Mine Company -- Accounting, 2 canlyniadau
- Wynn, John, Sir, 1553-1627, 1 canlyniadau
- Eure, Ralph Eure, Baron, 1558-1617, 1 canlyniadau
- Pughe, W. Owen (William Owen), 1759-1835, 1 canlyniadau
- Mostyn, Edward Pryce Lloyd, Baron, 1768-1854, 1 canlyniadau
- Lloyd, Howel, d. 1783, 1 canlyniadau
- Lloyd, Phoebe., 1 canlyniadau
- Society of Antiquaries of London., 1 canlyniadau
- Herschel, William, 1738-1822, 1 canlyniadau
- Pob un
- Copper mines and mining -- Wales -- Llandudno., 3 canlyniadau
- Copper industry and trade -- Wales -- Llandudno, 2 canlyniadau
- Copper ores -- Wales -- Llandudno, 2 canlyniadau
- Lead mines and mining -- Wales -- Mold, 1 canlyniadau
- Geology -- Scotland -- Western Isles., 1 canlyniadau
- Volcanism., 1 canlyniadau
- Beacons -- Wales -- Conwy., 1 canlyniadau
- Astronomy -- Experiments., 1 canlyniadau
- Solar eclipses., 1 canlyniadau
- Telescopes -- England., 1 canlyniadau
