R. H. C. Davis Collection (02-exws_davis), Notebook 38, "A Catalogue of Masons' Marks as an Aid to Architectural History" by R.H.C. Davis , Box 2, Folder 38, Western Michigan University Special Collections
source
R. H. C. Davis Collection (02-exws_davis), Notebook 38, "A Catalogue of Masons' Marks as an Aid to Architectural History" by R.H.C. Davis , Box 2, Folder 38, Western Michigan University Special Collections
Source
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