@misc{indiciaef106a9541fbd,
  title = {Astronomical photography, part T},
  author = {Dunkelman, L. and Mercer, R. D. and Ross, C. L. and Worden, A. M.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720015208},
  note = {Source identifier: 19720015208}
}