Knights Templar certificate issued to Sir Robert L. Percy by the Chapter of Observance, 1811, A1992-067-016, Box: 5, Folder: 1. Scottish Rite Masonic Museum & Library.
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Knights Templar certificate issued to Sir Robert L. Percy by the Chapter of Observance, 1811, A1992-067-016, Box: 5, Folder: 1. Scottish Rite Masonic Museum & Library. https://srmml.libraryhost.com/repositories/2/resources/3750 Accessed December 13, 2025.
