Nodiadau, rhaglenni, taflenni, a chyfnodolion Cymraeg a Saesneg, 1965, a grynhowyd gan Dr Marshall Lloyd, yn ymwneud â'i ymweliad â Phatagonia ar achlysur dathlu canmlwyddiant Y Wladfa Gymreig. = Notes, pictures, programmes, leaflets, and Welsh and Spanish periodicals, 1965, accumulated by Dr Marshall Lloyd, relating to his visit to Patagonia during the centenary celebrations of the founding of Y Wladfa, the Welsh colony.