@misc{indiciae2ec2d7215cd8,
  title = {Space Propulsion Technology Program Overview. Fact Sheets: Element Characterization and Funding Schedules},
  author = {Escher, William J. D.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930074428},
  note = {Source identifier: 19930074428}
}