U.S. Dept. of the Interior, Geological Survey ; Free on application to Branch of Distribution, U.S. Geological Survey,

National Park Service, Pacific Northwest Region,

Mount St. Helens Geological Area, Gifford Pinchot National Forest, U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region,

U.S. Dept. of the Interior, Geological Survey ; For sale by the Supt. of Docs, U.S. G.P.O.,