by J.L. Meuschke ... [and others] ; Department of the Interior, United States Geological Survey ; prepared in cooperation with the Minnesota Geological Survey
by John C. Behrendt [and others] ; Department of the Interior, United States Geological Survey ; prepared in cooperation with the National Science Foundation
by John C. Behrendt [and others] ; Department of the Interior, United States Geological Survey ; prepared in cooperation with the National Science Foundation