@article{1388982,
      recid = {1388982},
      author = {Siddall, Ruth,},
      title = {Natural stone and world heritage : the castles and town  walls of King Edward in Gwynedd /},
      pages = {1 online resource :},
      url = {http://library.usi.edu/record/1388982},
      doi = {https://doi.org/10.1201/9781003002444},
}