RG21, R214, Accession/BAN: 2015-00766-0, File number: CEF 19-28, File title: Royal Observatory Ottawa Ont, File part of: Department of Mines and Resources buildings [architectural drawing], Date: 1902-1953, Item ID number: 4817661 RG21, R214, acquisition/BAN : 2015-00766-0, numéro de dossier : CEF 19-28, titre du dossier : « Royal Observatory Ottawa Ont, File part of: Department of Mines and Resources buildings [architectural drawing] », date : 1902-1953, numéro d'identification : 4817661