Eugene C. Callaghan—USGS—Volcanoes of the Cascade Range.
Clarence Samuel Ross—USGS—Valles volcano, New Mexico.
Albert Herbert Koschmann—USGS—Cripple Creek Crater, Colorado.
Wilbur Swett Burbank—USGS—Silverton caldera, Colorado.
Hugh Dinsmore Miser—USGS—Volcanoes of the Gulf coastal plain.
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