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663974 Engineering Archaeological Services Ltd Projects Archive Four photogrammic elevations showing the northern, southern, western and eastern exterior elevations of Y Sospan, Llys Owain, Dolgellau. Produced by I. P. Brooks of Engineering Archaeological Services Ltd, June 2019. ffotograff
663996 Engineering Archaeological Services Ltd Projects Archive Photographic survey of Y Sospan, Llys Owain, Dolgellau. Produced by I. P. Brooks of Engineering Archaeological Services Ltd, June 2019. DWG files. ffotograff
663995 Engineering Archaeological Services Ltd Projects Archive Diagrams depicting four trusses at Y Sospan, Llys Owain, Dolgellau. Produced by I. P. Brooks of Engineering Archaeological Services Ltd, June 2019. DWG files. graffig