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WikiPedia: Gấu xám California http://www.fresnobee.com/2014/07/19/4031838/our-vi... http://www.takepart.com/article/2014/06/20/new-mov... http://www.takepart.com/article/2015/07/28/environ... http://action.biologicaldiversity.org/p/dia/action... http://ww2.kqed.org/science/2013/06/05/deextinctio... http://ww2.kqed.org/science/2016/05/02/grizzly-bea... https://www.amazon.com/California-Grizzly-Tracy-I-... https://archive.org/details/largemammalresto0000un... https://archive.org/details/largemammalresto0000un... https://web.archive.org/web/20170525070526/http://...