@misc{indiciae835508fedfdc,
  title = {OAST Space Theme Workshop. Volume 2: Theme summary. 6: Advanced transportation systems. A: Theme statement. B. 26 April 1976 presentation. C. Theme summary. D. Initiative actions},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19790006948},
  note = {Source identifier: 19790006948}
}