Collection search - Plan showing location of S.1/2-L.S.2.-Sec.6-T.31-R.21-W.4thM. leased by H. Trentham, showing means of access, method of working & ventilating coal mines to be started on above leasehold no. 1618. Traced by N. R. I. Branch [Natural Resources Intelligence Branch, Department of the Interior]. [cartographic material]

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