@misc{indiciaec039917e4cf3,
  title = {Computer program utilizes FORTRAN 4 subroutines for contour plotting},
  author = {Block, N. and Garret, R. and Lawson, C.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670000323},
  note = {Source identifier: 19670000323}
}