Article History
First Online: 28 June 2019
Compliance with Ethical Standards
:
: The author has no conflict of interest to report, neither from industry, the Park Service, or the UC.
: The research conducted for this paper has been in full compliance with ethical standards of the University of California and permitted with the National Park Service. The research has been conducted in accordance with ethical standards of research set forth by the University of California, Merced.
: There were no human subjects or survey participants involved in this research and therefore no need or use of informed consent. Archival materials were utilized to acquire historic photos through permit agreement.