The top documents tagged [ton arco sps sps]

197019711972197319741975197619771978197919801970 ARCO diversifies into coal. Core sampling showed Powder River Basin, in Wyoming, to be a strong resource.

197019711972197319741975197619771978197919801970 ARCO diversifies into coal. Core sampling showed Powder River Basin, in Wyoming, to be a strong resource.

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