1923. 2018-06-25T20:10:55Z. 2022-12-06T17:00:00Z. Boyd, W. H. Geological Survey. English. cartographic image. Public. Chu Chua Creek Region (B.C.).
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1923. 2018-06-25T20:09:18Z. 2022-12-06T16:59:46Z. Boyd, W. H. Geological Survey. English. cartographic image. Public. Foghorn Creek Region (B.C.) and Clearwater River Region (B.C.).
1920. 2018-06-25T20:02:02Z. 2018-09-05T20:06:50Z. Boyd, W. H. Geological Survey. English. cartographic image. Public. Monitor (Alta.) and Macklin (Sask.).