جلد1:
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جلد2:
http://dl.irebooks.com/Downloads/Ebooks/Ravanshenasi/johngraypart2(www.omideiran.net)(www.irebooks.com).zip
جلد3:
http://dl.irebooks.com/Downloads/Ebooks/Ravanshenasi/johngraypart3(www.omideiran.net)(www.irebooks.com).zip
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