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WikiPedia: Gà_Orloff http://www.feathersite.com/Poultry/CGK/Orloffs/BRK... http://www.feathersite.com/Poultry/Clubs/Orloff/Or... https://books.google.com/books?id=m2YXUOJEMeIC&dq=... https://archive.org/details/choosingkeepingc0000gr... https://archive.org/details/storeysillustrat0000ek...