Robert Ridgway: Malsamoj inter versioj
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* {{en}} [http://www.si.edu/ahhp/ScientificIllustrators/robtridgway.html Robert Ridgway, scienca ilustristo]
* {{en}} [http://www.si.edu/ahhp/ScientificIllustrators/johnridgway.html Lia frato, John L. Ridgway]
* {{en}} [http://books.nap.edu/html/biomems/rridgeway.pdf Robert Ridgway, biografio far de Alexandre Wetmore (''the National Academies Press'')] {{Webarchiv|url=https://web.archive.org/web/20110607103743/http://books.nap.edu/html/biomems/rridgeway.pdf |date=2011-06-07 }}
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