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scientific article published on 01 May 1983
scientific article published on April 1, 1987
scientific article published on 01 August 1990
scientific article published on 01 January 1969
scientific article published in 1993
scholarly article by W. H. Ficklin & F. N. Ward published 1976 in Journal of Research of the U.S. Geological Survey
article published in 1982
scholarly article
scientific article published in 1994
scientific article published in 1975
scholarly article
scientific article published in 1993
scientific article published in 1995
academic book chapter
scholarly article by W. Roger Miller et al published 1979 in Open-File Report
scientific article published in 1994
scientific article published in 1982