by Irving J. Witkind and others ; Department of the Interior, United States Geological Survey ; prepared in cooperation with the U.S. Atomic Energy Commission
by Irving J. Witkind and others ; Department of the Interior, United States Geological Survey ; prepared in cooperation with the U.S. Atomic Energy Commission
by F.O. Youngs ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the Utah Agricultural Experiment Station