| Reference | {Deposit:: GARDNER E D, 1939, TIN DEPOSITS OF THE BLACK HILLS, SOUTH DA}{Deposit:: USBM IC 7069, P 69.}{Deposit:: PAGE, LINCOLN R, ET AL, 1941, TIN BEARING PEGMATITES OF THE}{Deposit:: DISTRICT, LAWRENCE CO, SOUTH DAKOTA. USGS BULL 922-T, P 63} |