It can be found in the locked room within Charleston Cave.
So the Reds finally hit us, just like I always said they would. Vegas is still there as far as I know but that probably won't last long. Didn't get accepted into one of the Vaults, so I did the next best thing and had this place built. Got massive debts but who cares now? Ha! It's every man for himself now. Had to take care of the Paulson boy since he knew about this place - These supplies are for me and nobody else. There's a woman and her daughter up in one of the rooms in the lodge, might go pay 'em a visit tomorrow, a man's got needs.