#813 Anna Ritchie and Graham Ritchie - The Ancient Monuments of Orkney. Her Majesty's Stationery Office, Historic Scotland, 1990, 3rd edition, 2nd impression. #AnnaRitchie #GrahamRitchie #HMSO #HistoricScotland #Orkney #Archaeology #StandingStoneSunday #BookOfTheDay
#2 Anna Ritchie - Scotland BC: An Introduction to the Prehistoric Houses, Tombs, Ceremonial Monuments and Fortifications in the Care of the Secretary of State for Scotland. HMSO, Historic Scotland, 1992, 1st edition. #AnnaRitchie #HistoricScotland #HMSO #BookOfTheDay