Moen, W. S., & McLucas, G. B. (1981). Mount St. Helens ash--properties and possible uses. State of Washington, Dept. of Natural Resources, Division of Geology and Earth Resources : For sale by the Dept. of Natural Resources.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMoen, Wayne S., और Glennda B. McLucas. Mount St. Helens Ash--properties and Possible Uses. [Olympia, WA]: State of Washington, Dept. of Natural Resources, Division of Geology and Earth Resources : For sale by the Dept. of Natural Resources, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMoen, Wayne S., और Glennda B. McLucas. Mount St. Helens Ash--properties and Possible Uses. State of Washington, Dept. of Natural Resources, Division of Geology and Earth Resources : For sale by the Dept. of Natural Resources, 1981.
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