Papurau Islwyn Williams, papurau llenyddol yn bennaf, yn cynnwys sgriptiau radio teipiedig,1942-1963, storiâu byrion, sgriptiau drama, storiâu digrif, a chyfrolau o ddyfyniadau a nodiadau personol. = Papers of Islwyn Williams, mainly literary papers, including typed radio scripts, 1942-1963, short stories, drama scripts, humorous stories, and volumes of quotations and personal notes.