article by Pamela D. Derkey et al published 1998 in Open-File Report
scholarly article by Reed S. Lewis published in January 1999
scholarly article by Karen I. Lund published in January 1999
article
scientific article published in 1999
article by Pamela D. Derkey et al published 1996 in Open-File Report
scholarly article by F.K. Miller published in January 1999
article by Bruce R. Johnson & Pamela D. Derkey published 1998 in Open-File Report
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