scholarly article
scholarly article
scientific article published in 1984
scholarly article
Open-File Report published in 1964
scientific article published in February 1991
scientific article published in January 1978
scientific article published in May 2002
scholarly article
scientific article published in 1966
article
scientific article published in 1981
article from "Scientific American" published February 1980
article by Donald C. Noble et al published 1968 in Geological Survey research 1968, Chapter C
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