@misc{indiciaee37d463656c3,
  title = {Multi-stage sampling of forest resources by using space photography},
  author = {Aldrich, R. C. and Heller, R. C. and Langley, P. G.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19710002503},
  note = {Source identifier: 19710002503}
}