The Seyval Blanc reference article from the English Wikipedia on 24-Apr-2004
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Seyval Blanc

Seyval Blanc (aka Seyve-villard 5276) is a hybrid wine grape variety produced by Bertille Seyve or his son in law Villard. It is a cross of Seibel 5656 and Seibel 4986. It is the male parent of St. Pepin.