@misc{indiciae2c869b907198,
  title = {Old groundwater in parts of the upper Patapsco aquifer, Atlantic Coastal Plain, Maryland, USA: Evidence from radiocarbon, chlorine-36 and helium-4},
  author = {Niel Plummer and John R. Eggleston and Jeff P. Raffensperger and Andrew G. Hunt and Gerolamo C. Casile and D. C. Andreasen},
  year = {2012},
  doi = {10.1007/s10040-012-0871-1},
  url = {https://pubs.usgs.gov/publication/70043333},
  note = {Source identifier: 70043333}
}