I am grateful to the following institutions for granting permission for use of their images in these overlays and their work on these photographic efforts.
1887 - photographs taken for F. H. A. Scrivener's Codex S. Ceaddae Latinus
1911 - photographs taken under unknown circumstances, Lichfield Cathedral
1929 - Photostat copy produced by the National Library of Wales, Aberystwyth
1956 - slides likely taken by Brother Frowin Oslender, Bildarchive der Abtei Maria Laach. If you have information on these slides, please contact me. Special thanks to Rob Grose for his expertise in their digitization.
1962 - photographs taken by the Conway Library, Courtauld Institute of Art, London
2003 - photographs taken by the British Library, in collaboration with Lichfield Cathedral, England, and Llandeilo Fawr, Wales
2010 - my efforts, in collaboration with Lichfield Cathedral
Some Preliminary Results from Overlaying Historical Images