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Oxytropidoceras posted a topic in Fossil LiteratureThe Stuart R. Stidolph Diatom Atlas is now officially online as U.S. Geological Survey Open-File Report no. 2012-1163 by S. R. Stidolph, F. A. S. Sterrenburg, K. E. L. Smith, and A. Kraberg at http://pubs.usgs.gov/of/2012/1163/ . There are 1,002 diatom pictures, which can be downloaded for free as PDF files from http://pubs.usgs.gov...ges/plates.html . Although these are not fossil diatoms, they are still fascinating to look at. Best wishes, Paul H.