@article{252,
  author = {Ellis S.},
  title = {The distribution, abundance conservation management of butterflies on Magnesian Limestone grassland sites in north-east England,},
  year = {1999},
  journal = {Transactions of the Natural History Society of Northumbria,},
  volume = {59},
  pages = {149-168},
  month = {1999},
  language = {eng},
}