@misc{indiciaed9e0778157ac,
  title = {Inertial instrument system for aerial surveying},
  author = {R. H. Brown and W. H. with contributions by the following: Chapman and W. F. Hanna and C.E. Mongan and J.W. Hursh},
  year = {1987},
  doi = {10.3133/pp1390},
  url = {https://pubs.usgs.gov/publication/pp1390},
  note = {Source identifier: pp1390}
}