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- ebrary, Inc73
- Oxford University Press53
- ProQuest (Firm)43
- National Museum of Wales38
- National Library of Wales34
- Great Britain. Office of Population Censuses and Surveys32
- Adam Matthew Digital (Firm), digitiser27
- England and Wales26
- Thomas, Dylan, 1914-195326
- Great Britain22
- Great Britain. Welsh Office22
- University of Wales. Board of Celtic Studies22
- Williams, Glanmor21
- Cary, John, approximately 1754-183520
- Giraldus, Cambrensis, 1146?-1223?19
- Project Muse. distributor19
- Sime, Stuart19
- Cadw (Organization : Great Britain)18
- England and Wales. Parliament17
- Great Britain. Ordnance Survey17