@misc{indiciaefcbd1fe3b7d2,
  title = {The age of groundwater in the Lincolnshire Limestone, England and its relevance to the flow mechanism},
  author = {R.A. Downing and D. B. Smith and F.J. Pearson and R.A. Monkhouse and R.L. Otlet},
  year = {1977},
  doi = {10.1016/0022-1694(77)90035-x},
  url = {https://pubs.usgs.gov/publication/70009887},
  note = {Source identifier: 70009887}
}