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- Map showing the location of Oba south southwest of Hearst - 29 May 2002.
Courtesy Ontario Ministry of Transportation.
- Inspection of Oba Gap Filler Site - 29 October 1963
Courtesy National Archives of Canada.
- Inspection: Oba Gap Filler Site - 31 July 1963
Courtesy National Archives of Canada.
- Requirement for Farm Type Gate on Access Road - 24 June 1963
Courtesy National Archives of Canada.
- Care & Custody: Construction Status - 17 September 1962
Courtesy National Archives of Canada.
- Gap Filler: Oba - 9 August 1962
Courtesy National Archives of Canada.
- Land Acquisition: Site & Access Road - 2 August 1962
Courtesy National Archives of Canada.
- Status Report on Oba - 31 July 1962
Courtesy National Archives of Canada.
- Reservation of Armco Steelox Components - 2 May 1961
Courtesy National Archives of Canada.
- Design Criteria for Standard Buildings - 14 Oct 1960
Courtesy National Archives of Canada.
- Preliminary CE Report & Cost Estimates - 1960
Courtesy National Archives of Canada.
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