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White, H. (1988) Warren, Coles Tump, Orcop Hill, Much Dewchurch: SMR record 6800 Historic Herefordshire Online, Herefordshire Sites and Monuments Record, Herefordshire Archaeology, Herefordshire County Council [online]

Note that while pillow mounds are usually regarded as late features, chiefly prepared rabbit warrens, there are a number of features on the hill that await concrete dating.