@misc{indiciaecea70e0acebb,
  title = {Alternative silvicultural approaches to timber harvesting: Variable retention harvest systems},
  author = {J.F. Franklin and D.F. Berg and D. Thornburg and J. C. Tappeiner},
  year = {1997},
  url = {https://pubs.usgs.gov/publication/70194151},
  note = {Source identifier: 70194151}
}