Armagh Observatory History and Architectur
Historical Resources and Information A Short History of Armagh Observatory by C.J. Butler An Historical Account ... by J.L.E. Dreyer The Architecture of Armagh Observatory by C.J. Butler Historical Archives by C. J. Butler Inventory of the Historical Instruments by J. McFarland Scientific Instruments and their Related Correspondence by J. McFarland Armagh's Longcase Regulators - PostScript or ...
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Instruments