His extensive notes and research are kept in the L. Tom Perry Special Collections at Brigham Young University.

Reagan published a book, Don Diego, through the Alice Harriman Company in New York in 1914.

He wrote two articles about the influenza epidemic of 1918, which are among the most widely cited primary sources about the impact of the epidemic among the Navajo.

[1] He had arrived in Navajo country in October 1918, after being appointed the Indian Service school administrator at Marsh Pass near Kayenta, Arizona.

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