William Taft actually said...
It is hereby ordered that the following described lands in the State of Idaho, viz: All that part of T. 15 S., R. 4 E., Boise meridian, lying and being west of a line formed by extending the east boundary line of the Duck Valley Indian Reservation through the said township, be, and the same are hereby withdrawn from settlement, entry, and sale, and set apart as an addition to the Duck Valley Indian Reservation
06/30/1910