Llyfr Oriau o'r bymthegfed ganrif a chofnodion Mona and Parys Mines Co. Ltd. yw dau o’r trysorau archif a ddiogelwyd gan Lywodraeth Cymru eleni.
A fifteenth century book and the records of the Mona and Parys Mines Co. Ltd. are two of the archive treasures being preserved this year.