@misc{indiciae18e45605737b,
  title = {Research program on the Manson impact structure, Iowa},
  author = {Shoemaker, E. M. and Roddy, D. J. and Anderson, R. R.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940016293},
  note = {Source identifier: 19940016293}
}