@misc{indiciae4251aa19733c,
  title = {Digital computer terrain mapping from multispectral data, and evaluation of proposed Earth Resources Technology Satellite /ERTS/ data channels, Yellowstone National Park - Preliminary report},
  author = {Hoffer, R. M. and Pierce, K. L. and Smedes, H. W. and Tanguay, M. G.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19710009779},
  note = {Source identifier: 19710009779}
}