@misc{indiciae67422656d8d8,
  title = {A new objective for the Allegheny Observatory 30-inch refractor},
  author = {Gatewood, G. D. and De Jonge, J. K. and Stein, J. and Difatta, C.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19860053395},
  note = {Source identifier: 19860053395}
}