@misc{indiciae1a3dc5868df0,
  title = {Aerial survey as a technique for estimating manatee population size and trend - problems and prospects},
  author = {L.W. Lefebvre and B.B. Ackerman and Kenneth M. Portier and K. H. Pollock},
  year = {1995},
  url = {https://pubs.usgs.gov/publication/2002796},
  note = {Source identifier: 2002796}
}