The ISBN system was devised beginning in 1967, and books published prior to then don't have "editions" associated with them. It's very similar with movie, music and video game UPCs. It's also possible that a seller listed an item with us and didn't include an ISBN/UPC with the listing. You'll find items like this by clicking this link.
Reviews of Sudan: A Critical Moment for the C.P.A., Darfur, and the Region: Hearing Before the Committee on Foreign Relations, United States Senate, One Hundred Eleventh Congress, Second Session, May 12, 2010
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