English: Calkins, Gary N. (1902) Marine Protozoa from Woods Hole, Bulletin of the United States Fish Commission, vol.21, 1901, Washington, DC: Government Printing Office
This is a photograph from the Freshwater and Marine Image Bank at the University of Washington. Materials in the Freshwater and Marine Image Bank are in the public domain. No copyright permissions are needed. Acknowledgement of the Freshwater and Marine Image Bank as a source for borrowed images is requested.
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