@misc{indiciae9fe79c46c272,
  title = {System for plotting subsoil structure and method therefor},
  author = {Narasimhan, K. Y. and Nathan, R. and Parthasarathy, S. P.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800024076},
  note = {Source identifier: 19800024076}
}