@misc{indiciaeb42ef9fb8b70,
  title = {40AR/39Ar ages of six Apollo 15 impact melt rocks by laser step heating},
  author = {G. Brent Dalrymple and Graham Ryder},
  year = {2012},
  doi = {10.1029/91gl01143},
  url = {https://pubs.usgs.gov/publication/70243172},
  note = {Source identifier: 70243172}
}