@misc{indiciae1ab1f747d481,
  title = {Surface structure of ammonium perchlorate composite propellants},
  author = {Beckstead, M. W. and Boggs, T. L. and Derr, R. L.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700047118},
  note = {Source identifier: 19700047118}
}