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    Archive NumberTitleLevelDescriptionMediumImagesArchive Number6355683TitleAP_2009_3440 - RCAHMW Colour Oblique Digital Aerial PhotographsLevelItemDescriptionRCAHMW colour oblique aerial photograph of the Derlwyn Isaf cairnfield from the west. Taken on 14 October 2009 by Toby DriverMediumPhoto.ImagesyArchive Number2023-06-13_6998TitleUIMP_09 Uplands Initiative Machine PlotsLevelBatchDescriptionCwm Twrch (west) survey (Bryn Henllys, Derlwyn Isaf), 1993. Machine Plot. SN71. To scale 1: 2500. Produced as part of the RCAHMW's Upland Initiative project, 1993 - 2000.Medium6 A3 pages. Cartographic.Imagesn