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WikiPedia: Sẻ_ngô_than http://www.birdsireland.com/pages/site_pages/featu... http://daten.digitale-sammlungen.de/~db/0003/bsb00... http://gdz.sub.uni-goettingen.de/no_cache/dms/load... http://gdz.sub.uni-goettingen.de/no_cache/dms/load... http://gdz.sub.uni-goettingen.de/no_cache/dms/load... http://gdz.sub.uni-goettingen.de/no_cache/dms/load... http://www.birds.cornell.edu/clementschecklist/dow... http://gallica.bnf.fr/ark:/12148/bpt6k74821j http://www.ibercajalav.net/img/392_CoalTitPater.pd... http://www.archive.org/details/birdsofwesternch181...