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by Hiebert, Ronald D., Stubbendieck, James L.
Denver, Colo. (P.O. Box 25287 (WASO-NRPO), Denver 80225-0287) : U.S. Dept. of the Interior, National Park Service, Natural Resources Publication Office, 1993
Denver, Colo. (P.O. Box 25287 (WASO-NRPO), Denver 80225-0287) : U.S. Dept. of the Interior, National Park Service, Natural Resources Publication Office, 1993
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