Papurau Gwilym Alaw, 1832-1917, Castell Rhigos, yn cynnwys cerddi a rhyddiaith a gyfansoddwyd ganddo ef ac eraill, ynghyd â llyfrau nodiadau, torion o'r wasg a defnyddiau eraill perthynol, a hefyd nodiadau ganddo a deunydd arall a gasglodd yn ymwneud yn bennaf â hanes lleol, 1832-1909 = Papers of Gwilym Alaw, 1832-1917, of Castell Rhigos, comprising poetic and prose compositions by himself and others, together with related notebooks, press cuttings and other material, and also notes by him and other material collected by him relating mainly to local history, 1832-1909.