@misc{indiciaeb4f66e398cbe,
  title = {Experimental duck hunting seasons, San Luis Valley, Colorado, 1963-1970},
  author = {Richard M. Hopper and Aelred D. Geis and Jack R. Grieb and Lewis Nelson},
  year = {1975},
  url = {https://pubs.usgs.gov/publication/5230202},
  note = {Source identifier: 5230202}
}