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  • no descriptionno description3/16/2018
  • The Institution of Surveyors plaque on the Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 2016The Institution of Surveyors plaque on the Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 201612/28/2017
  • The Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 2016The Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 201612/28/2017
  • The Institution of Engineers Australia plaque on the Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 2016The Institution of Engineers Australia plaque on the Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 201612/28/2017
  • The National Engineering Landmark plaque on the Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 2016The National Engineering Landmark plaque on the Mitchells Ridge 'Trig' memorial column.
1728, Sunday, 3 October, 201612/28/2017
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