@misc{indiciaec3bdb0d4b544,
  title = {Tool samples subsurface soil free of surface contaminants},
  author = {Kemmerer, W. W. and Wooley, B. C.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670000473},
  note = {Source identifier: 19670000473}
}