1. Brewer, W. H., 1871, Animal Life in the Rocky Mountains of Colorado: The American Naturalist: v. 5, no. 4: p. 220-223.

BibTeX
@article{brewer1871animal,
    author = "Brewer, W. H.",
    title = "Animal Life in the Rocky Mountains of Colorado",
    year = "1871",
    journal = "The American Naturalist",
    url = "https://doi.org/10.1086/270746",
    doi = "10.1086/270746",
    number = "4",
    pages = "220-223",
    volume = "5"
}

2. 1877, The Age of the Rocky Mountains in Colorado: Scientific American: v. 3, no. 67supp: p. 1059-1059.

BibTeX
@article{crossref1877the,
    title = "The Age of the Rocky Mountains in Colorado",
    year = "1877",
    journal = "Scientific American",
    url = "https://doi.org/10.1038/scientificamerican04141877-1059dsupp",
    doi = "10.1038/scientificamerican04141877-1059dsupp",
    number = "67supp",
    pages = "1059-1059",
    volume = "3"
}

3. Winwood, H. H., 1885, Geological Age of the Rocky Mountains: Geological Magazine: v. 2, no. 5: p. 240-240.

BibTeX
@article{winwood1885geological,
    author = "Winwood, H. H.",
    title = "Geological Age of the Rocky Mountains",
    year = "1885",
    journal = "Geological Magazine",
    url = "https://doi.org/10.1017/s0016756800152033",
    doi = "10.1017/s0016756800152033",
    number = "5",
    pages = "240-240",
    volume = "2"
}

4. 1889, New Railroad Over the Rocky Mountains of Colorado: Scientific American: v. 60, no. 1: p. 7-7.

BibTeX
@article{crossref1889new,
    title = "New Railroad Over the Rocky Mountains of Colorado",
    year = "1889",
    journal = "Scientific American",
    url = "https://doi.org/10.1038/scientificamerican01051889-7",
    doi = "10.1038/scientificamerican01051889-7",
    number = "1",
    pages = "7-7",
    volume = "60"
}

5. Ramaley, Francis, 1907, Plant Zones in the Rocky Mountains of Colorado: Science: v. 26, no. 671: p. 642-643.

BibTeX
@article{ramaley1907plant,
    author = "Ramaley, Francis",
    title = "Plant Zones in the Rocky Mountains of Colorado",
    year = "1907",
    journal = "Science",
    url = "https://doi.org/10.1126/science.26.671.642",
    doi = "10.1126/science.26.671.642",
    number = "671",
    pages = "642-643",
    volume = "26"
}

6. Cobban, W. A, 1951, Scaphitid cephalopods of the Colorado Group, 239 of United States Geological Survey, Professional Paper.

BibTeX
@misc{cobban1951scaphitid1,
    author = "Cobban, W. A",
    title = "Scaphitid cephalopods of the Colorado Group, 239 of United States Geological Survey, Professional Paper",
    year = "1951",
    howpublished = "p.1-42",
    note = "talkorigins\_source = {true}; raw\_reference = {Cobban, W. A., 1951, Scaphitid cephalopods of the Colorado Group, 239 of United States Geological Survey, Professional Paper: p.1-42.}"
}

7. Cobban, W.A., 1951, Scaphitoid cephalopods of the Colorado group: Professional Paper.

BibTeX
@misc{cobban1951scaphitoid,
    author = "Cobban, W.A.",
    title = "Scaphitoid cephalopods of the Colorado group",
    year = "1951",
    booktitle = "Professional Paper",
    url = "https://doi.org/10.3133/pp239",
    doi = "10.3133/pp239"
}

8. HEEDE, Burchard H., 1970, MORPHOLOGY OF GULLIES IN THE COLORADO ROCKY MOUNTAINS: International Association of Scientific Hydrology. Bulletin: v. 15, no. 2: p. 79-89.

BibTeX
@article{heede1970morphology,
    author = "HEEDE, Burchard H.",
    title = "MORPHOLOGY OF GULLIES IN THE COLORADO ROCKY MOUNTAINS",
    year = "1970",
    journal = "International Association of Scientific Hydrology. Bulletin",
    url = "https://doi.org/10.1080/02626667009493955",
    doi = "10.1080/02626667009493955",
    number = "2",
    pages = "79-89",
    volume = "15"
}

9. Glanzman, V. M., 1992, Bibliography of publications prepared by U.S. Geological Survey personnel under cooperative programs with the U.S. Department of Energy and predecessor agencies, 1957-1991, with emphasis on nuclear testing programs: Open-File Report.

BibTeX
@article{doi103133ofr92502,
    author = "Glanzman, V. M.",
    title = "Bibliography of publications prepared by U.S. Geological Survey personnel under cooperative programs with the U.S. Department of Energy and predecessor agencies, 1957-1991, with emphasis on nuclear testing programs",
    year = "1992",
    booktitle = "Open-File Report",
    url = "https://pubs.usgs.gov/of/1992/0502/report.pdf",
    doi = "10.3133/OFR92502",
    is_oa = "true",
    semanticscholar_citation_count = "1",
    semanticscholar_id = "7902a1c2dac250493b62f357695d5fbdeaf61a84"
}

10. 2010, Colorado and Southern Rocky Mountains: Uranium Deposits of the World: p. 253-280.

BibTeX
@incollection{crossref2010colorado,
    title = "Colorado and Southern Rocky Mountains",
    year = "2010",
    booktitle = "Uranium Deposits of the World",
    url = "https://doi.org/10.1007/978-3-540-78943-7\_7",
    doi = "10.1007/978-3-540-78943-7\_7",
    pages = "253-280"
}

11. Boucot, A. and Poinar, G., 2010, Fossil Behavior Compendium.

BibTeX
@article{doi1012019781439810590,
    author = "Boucot, A. and Poinar, G.",
    title = "Fossil Behavior Compendium",
    year = "2010",
    url = "https://www.semanticscholar.org/paper/fa87f7da40567a0fb1dc542e95956fb663930760",
    doi = "10.1201/9781439810590",
    is_oa = "true",
    semanticscholar_citation_count = "126",
    semanticscholar_id = "fa87f7da40567a0fb1dc542e95956fb663930760"
}

12. Prost, Gary L., 2020, Colorado Rocky Mountains: North America’s Natural Wonders: p. 137-169.

BibTeX
@incollection{prost2020colorado,
    author = "Prost, Gary L.",
    title = "Colorado Rocky Mountains",
    year = "2020",
    booktitle = "North America’s Natural Wonders",
    url = "https://doi.org/10.1201/9781003015468-4",
    doi = "10.1201/9781003015468-4",
    pages = "137-169"
}

13. None, Colorado and Southern Rocky Mountains: SpringerReference.

BibTeX
@misc{crossrefNonecolorado,
    title = "Colorado and Southern Rocky Mountains",
    year = "None",
    booktitle = "SpringerReference",
    url = "https://doi.org/10.1007/springerreference\_204996",
    doi = "10.1007/springerreference\_204996"
}