@misc{indiciaeaa041bb73ecb,
  title = {A simple portable somomicrometer, March - July 1966},
  author = {Kardon, M. B. and Stegall, H. F. and Stone, H. L.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19670007926},
  note = {Source identifier: 19670007926}
}